Yes, Joanne, it has something to do with you as it is an event in your FAMILY - and you are a family. Let's go by the numbers:
1. Check the 'net: DNA testing is now available in some places BEFORE the child is born, and does no harm to the fetus. You might want to see if that is an option so you can remove any doubt. (I work in the child support/paternity business, and a guy's denial is always common; DNA testing removes all doubt.)
2. If #1 isn't possible, wait for the birth to do the DNA testing. Either your husband or the girl can open a case with the state child support agency and get DNA testing for free or at very little cost.
(Based on the result, a lot of things could happen, but no use worrying about those now.) Walgreen also sells a kit for about $30 (Then $150 for processing) if you don't want to use the state.
3. Before, during and after the testing, try to get your house in order as best you can. Sounds like you have a lot of things to work through, but if nothing else, due it for the sake of your daughter. Give her the opportunity for a great life. Good luck.