it happened to me but i didnt worry about it

If they are that close together and consistent it might be real labor do you have any other labor symptoms? maybe call your Dr idk lol I'm 38 weeks and here lately after I orgasam I get some contacts but there not that close together

sex can also induce labor I believe like If your cervix is already softened. it helps thin it out morr

Shouldn't be. Sex can trigger contractions because orgasms can cause the uterus to contract. If they've stopped most likely they were Braxton hicks contractions, real labor contractions wouldn't stop. But if you're worried call your doctor!