My cycles have been max 40 days and been having unprotected sex for 7 months.. Miscarried in july, and been very wakky... It seems that my period only comes the day after I take a pregnancy test, and I get very sad when it turns out negative :(

My last cycle was 52 days which has never happened to me before, but it does seem that every time I take a preggy test that I finally get that dissapointment. None of my doctors can find a reason with test that I cant get pregnant faster ( I have a son whom turns five on valentines day and I lost a baby last february and I havent been on birth control since 9/01). I may have been stressed, but I don't recall feeling it unless I am good at not recognizing it. My doctor kinda grasped this theory that I am too fat to get pregnant, which I know heavier woman that have tons of kids, but maybe because I gained like 100 lbs. In the last 5-6 years. Who knows? Many of us are just doomed to have to really work at this. Wish it was easier!