oh man that is extremely confusing!! i would be going back to the doctors and asking for another test, or a referral for an u/s just to be sure. so you said after DH got the snip, you got pregnant and had another baby?? hmmm....his sperm must be awesome swimmer!! don't feel stupid, it's perfectly legit, and something you need to get checked out, especially since it's happened before. all the best!!