OC - I've been here a LOOOONG time, and seen SEVERAL cases where the OW lied about being pregnant. So no, I don't think it's unreasonable that you have doubts.
Should H be her support? No, in my book. She CHOSE to have sex with a married man, she CHOSE to use less than two simultaneous forms of birth control, and she CHOSE to abort (if she did). If she really WAS pregnant, she could have chosen to do the noble thing - leave your H alone, have the child, and give it up for adoption to a loving family. Your H didn't FORCE her to have an abortion.
It's a tough place you're in. If you try to point out any holes in OWs story, you look bad. But if you're too understanding, you give OW the opportunity to sink her hooks further into H.
