My new book says that an expected due date can be calculated as follows: Take the first day of your last period, subtract three months and add seven days.
May 7 minus three months is February 7. Add seven days, and you've got February 14, Valentine's Day. That would make the child the ever socially-conscious Aquarius. Just a few days later, and he or she would be a Pisces.
Either way, belated or not, I'm thinking this baby will be the best Valentine's Day gift I could ever give or receive.