What would you do??

Answer to if I talk to him he denied it at first I have screenshots of their messages and he got angry and didn't respond to the fact that there was proof they had talked and hung out.

Original: So I found out September 12th I'm expecting. Over the moon tried for so long.. well get put on bed rest at 9 weeks and then out of nowhere a woman messages me and says she is pregnant with my husband's baby. Sends picture of pregnancy test and her ER paperwork. I'm so lost I don't even wanna look at my husband I feel so devastated that this could be a possibility... What should I do? Should I leave? Should I try to work this out?