BFP to BFN 😞

Jenn
Hi all! Last week I had a faint positive then had my period (which was heavy and painful) and the faint positive is slowly fading away which makes me believe I had a chemical pregnancy. This is my second time getting prego within 4 months as I miscarried in august. I go to the doctor tomorrow I am just curious if this has happened to anyone else and has gone on to have a  3rd healthy pregnancy? I obviously have no problem getting pregnant it's staying pregnant that is the issue. Any help would be appreciated!