Am I in Labor

I haven't been timing my possible contractions very long. They are consistently 45-60 seconds so far but range from 5-10 mins apart. I'm a FTM. They feel a lot like intense period cramps. I've had no bloody show or water leaking. Possibly lost mucus plug earlier but also been losing bits of it for weeks. Have had braxton hicks that I've never timed for weeks also but this was more intense. Tmi here but had a loose bowel movement yesterday morning and sex last night. He orgasmed I didn't (haven't been able to for awhile, it sucks 😐)Ever since the sex things have felt different. Just started timing 30 mins ago. 38 weeks along and my cervical check a few weeks ago was 3.5 dialated and 50% effaced. Help?