Cramping at 35 weeks (tmi at end)

*Tmi, sex related at the end*

I'll be calling my doctor when they open on Tuesday but I'm just wondering if anyone had experienced this. I'm 35 weeks and 4 days, I've been getting painful period-like cramps in my lower belly (with no tightning) for the past few days. It comes and goes through out the day but it can get really painful.

I got the cramps really bad when me and my husband were "getting it on". He wasn't rough at all and I didn't finish but the cramps got so bad he had to stop, and I continued to have the pain for awhile after