Scared to Orgasm

Ok so the past week, I have woken up twice to a "wet" dream and after my orgasm, I cramped REALLY bad. Both lasted at least 2-3 mins and I also got really hot. Today I decided to masterbate in the shower and after my orgasm, I cramped really bad again, lasting 2 mins. So now I am afraid to do anything anymore and I still have not had sex with my husband since we got pregnant. I am currently 4 weeks and 3 days. Did anyone else experience this??? It really sucks :(