I felt like that this pregnancy, not in any others. I was convinced I was getting my period, I slept with towels under me cause I thought it was going to be a bad one. Never had cramps in any other pregnancy either
I've heard many women say they feel like they started their period in early pregnancy due to increased discharge.
Cramping is pretty normal for pms. I don't know why you would feel you are leaking if your period hasn't started yet...