She has been robbed of the chance to carry her own baby, and says she feels powerless.

Shannon and Paul Morell have twin daughters, age 2 1/2. They had been discussing trying to have another child using the six embryos they'd frozen when their daughters were conceived via IVF.

But then they got the phone call that would change their lives ... the fertility clinic had made a mistake, and had implanted their embryos into another woman. That woman was now pregnant.

"We had no idea who this person was," Shannon Morell tells "Today." "Were they good people?"

They were. On Monday, we told you about Carolyn Savage -- the woman who was implanted with Shannon's embryos. She has decided to carry the baby to full term and to give the baby over to the Morells after the birth.

"It's just the oddest feeling to have somebody else carrying your child because, as a parent, you want to do everything possible to protect your child. We were totally powerless and out of control. Even though we were grateful, it was just a terrible feeling," Shannon Morell says.

Morell says attending doctor visits has been difficult. "You walk in there, and I just sort of felt like an outsider," Shannon said. "Carolyn and Sean were there -- very welcoming. But it's a lot different when you're going through it yourself. I'm grateful she invited me. It was very, very neat to see."

Shannon says she's been robbed of many emotions. "All the emotions a woman has during pregnancy to bond with her child I haven't had," Shannon tells Meredith Vieira. "It's been a very empty feeling. All the emotions from nine months are packed into that one day when I actually get to hold my baby. I never felt the baby kick -- none of that. So it'll be amazing."

The two families have talked about exchanging e-mails to keep the Savages appraised of the baby's progress once he or she is born. But neither family really knows how it will work out.

"We'll at least keep in contact, but we have no expectation of them," Shannon Morell says. "The nice thing is that we've been able to work together on this. Unfortunately, it's been a terrible thing that's happened to the families. We're doing the best that we can for the health of this baby."