Interesting that you say that. Mom #1 gave you an out. At the time you didn't take it. Was it because you thought any money for a short time was better than non since you didn't have other options as in you said ok for the wrong reason. We talk a lot on these boards about how sometimes we take the FIRST family that comes along instead of holding out for the RIGHT family.
Maybe you are being shown that you don't have to settle but can do what is right for your group. I think it would be worth interviewing both potential families and then weighing it against the interview information letting the pregnancy part just be an extra piece of info. If that didn't apply which family would you have signed on and then maybe it would be worth actually doing it.