Fertile/pregnancy not sticking?

Danylle
I had a chemical pregnancy in February and became pregnant in March. I miscarried this baby a few weeks ago. I was in my first trimester and this was my first pregnancy  seeing and hearing the heartbeat. I'm nervous about trying again. I have my follow up appointment tomorrow with doctor. I keep getting pregnant but they don't stick. Anyone   have a similar experience? Not sure if there's something wrong? I might seek a specialist!