After being together for five years, Heather and Maria “Mar” del Mar are making their final preparations in anticipation of a ruling from the Supreme Court that could mean they can stay together in the United States.

Heather, a U.S. citizen, and Mar, a Spanish national, have already completed their I-130 marriage-based green card application and have sent it to the LGBT group Immigration Equality with the expectation that the high court will strike down the Defense of Marriage Act.

“We’re actually largely done with that,” Heather said. “Our intention on that front is, of course, to file that petition the first day it’s legally viable to do so.”

Although Mar has legal status because she’s living in the United States on a work visa, it expires in November. Section 3 of DOMA, which prohibits federal recognition of same-sex marriage, has blocked the New York City couple, who married in 2011, from a more permanent solution.

In March of last year, U.S. Customs & Immigration Enforcement denied Heather and Maria a marriage-based green card based on an earlier application, citing DOMA as the reason. They’re one of the estimated 28,500 bi-national same-sex couples in danger of separation.

That could change in the coming days. The Supreme Court is expected to deliver a ruling on the constitutionality of DOMA as a result of pending litigation along with ruling in a separate case challenging California’s Proposition 8.

If the court rules DOMA is unconstitutional, blocking the U.S. government from enforcing it, USCIS will have no legal reason to withhold the marriage-based green card from Heather and Mar.

Heather, a marketing director for a global non-profit organization in New York, said the wait for the decision has been “kind of surreal” and what’s been on the couple’s minds in the days heading to the ruling.

“We look at each other every night before we go to bed I would say for the last few weeks, where it’s been kind of like a month countdown, and we’ve said, “Oh my God, what is it going to really be like the day after?” she said. “How much is our life going to change when this issue isn’t a huge weight on our relationship and even on our everyday thought process.”

Mar, who works in marketing for a Spanish-language newspaper in New York, said a ruling against DOMA would lift a considerable burden because they are unable to plan for the future as they fear separation.

“We are really nervous because this would be a big change in our life,” Mar said. “We are very excited.”

As of today, the Supreme Court calendar designates only June 20 and June 24 as days on which opinions will be handed down; But with 14 cases yet to be decided, it is widely expected that they will add another day to the calendar, either June 26 or June 27 and the decisions for the marriage will be announced at that time.

And Heather and Mar, who are among the plaintiffs in Immigration Equality’s lawsuit against DOMA, already have plans. On the last Saturday of the month, they’re inviting friends and family to come to their home to celebrate the moment when the federal government will view their relationship as legally equal to others.

“We actually already have — I guess this is probably superstitious; I shouldn’t say this out loud — but we actually already have a celebration planned for family and friends — we have to be optimistic — for Saturday night on the 29th,” Heather said. “So, we’re celebrating at our place.”

And what if the Supreme Court rules in favor of DOMA? Heather said it’s not an outcome they like to consider, but in that event, they’d pursue additional litigation, find a way to renew Mar’s work visa and push for the inclusion of gay couples in comprehensive immigration reform legislation.

“To be honest, it will just be devastating; all of those things are just technically the things that we’ll do,” Heather said. “I’ll tell you what we’re going to do; we’re going to start a family anyway because we refuse to live at the effect of our circumstances. We’ve already postponed things in our life much more than is fair — and we’ll consider the option of moving to Spain where our marriage is recognized.”

But Heather and Mar are just one of many bi-national same-sex couples readying for a Supreme Court ruling that would ensure they can stay together in the United States.

Rachel Tiven, executive director of Immigration Equality, said she’s expecting thousands of green card applications from bi-national same-sex couples in the months following a court ruling against DOMA.

“We think that there will be over the first year many thousands,” Tiven said. “I think in the remaining five months of the year, we’ll see something between 2,000 and 10,000 applications, but that’s a guess.”

In the meantime, Tiven said her organization is already preparing some applications for same-sex bi-national couples and making plans for others to renew applications that were previously denied.

“We’re preparing some families who will file immediately if the Supreme Court will enable them to do so,” Tiven said. “Other families who filed a long time ago — either because they were plaintiffs, or because it was a step to seeking deferred action — we are asking the administration, for those who were denied, we’re asking the administration to reopen those applications so they don’t have to file all over again, and don’t have to pay the fee again.”

In order to facilitate the expected increase in couples filing marriage-based green card applications, Immigration Equality’s legal team has conducted two trainings last week for attorneys who have signed up to assist couples with their petitions following a court ruling striking down Section 3 of DOMA.

Steve Ralls, a spokesperson for Immigration Equality, said 150 lawyers from across the country to date have joined that network of attorneys and have taken part in one of those two trainings.

“As part of that training, our legal team discussed topics related to identifying issues that may arise for same-sex bi-national couples during implementation following the court’s ruling,” Ralls said. “A key goal is to ensure that attorneys working with LGBT families can also serve as watchdogs during that critical implementation period and report any issues they encounter with relevant government agencies in their processing of green card applications for affected families.”

Another couple making preparations in anticipation of a court ruling is Rachel Wilkins and Jennifer Blum, a New Jersey couple that married a year-and-a-half ago. Blum, a New Jersey native, is awaiting the opportunity to sponsor Wilkins, a British national, for residency in the United States.

The couple has never filed a marriage-based green card application before, but Blum, an attorney, said they’ve already hired an attorney to help them through the process in anticipation of a ruling against DOMA.

“We’ve hired an attorney to prepare our application for us,” Blum said. “So we’ve been really just trying to get all the paperwork together, and we’re excited for this decision to finally come to fruition, and we just want to move on with our lives.”

Wilkins, a curator who’s in the country on work visa, said she shares a sense of optimism that the Supreme Court will issue a decision that renders Section 3 of the the Defense of Marriage Act inoperable.

“I think we’re feeling optimistic,” Wilkins said. “We were watching the Supreme Court blog to see the orders handed down just waiting to see the right decision made.”

The couple came to D.C. when the oral arguments took place at the Supreme Court in March and had the opportunity to meet lesbian New Yorker Edith Windsor, who filed the lawsuit that’s currently before the court.

“We walked up on the steps and I lost it … because it’s just the culmination of so many people’s hard work, sweat, they’ve given so much to be able to get to this point where we could get this case in front of the Supreme Court, and for the Supreme Court to finally do the right thing, and for justice to be done,” Blum said.

Should the court strike down DOMA, Blum said they’ll celebrate by gathering at the Stonewall Inn in New York City, where riots began in 1969 that were considered the start of the modern gay rights movement.

“Legally, factually, I just can’t see the Supreme Court determining any other way,” Blum said. “Like I said, there’s no other option.”

Lavi Soloway, a gay immigration attorney at Masliah & Soloway and co-founder of The DOMA Project, said his firm worked for several months on preparing to file new marriage-based green card applications — some on the day the court issues a decision against DOMA — and has several filed in 2011 and 2012 that haven’t yet been denied.

“The couples have undertaken the preparation with the understanding that that the Supreme Court ruling on DOMA is not something that we can predict in advance, but it would be fair to say that their perspective, like mine, is cautiously optimistic,” Soloway said.

CORRECTION: An earlier version of this article misattributed quotes to Jennifer Blum and Rachel Wilkins. The Blade regrets the error.