Not sure if these are pre labor contractions or not but if they are, what can I do?

[Michelle]

I am 38w2d pregnant. Today and yesterday morning when I woke up I had a couple of very sharp cramps that lasted about 3-5mins and came about 30mins apart from each other. Yesterday they seemed to ease up and go away so I figured it was just Braxton Hicks contractions. But this morning when I woke up I started experiencing the exact same and they were very sharp. I only had a couple sharp cramps that lasted about the same as the others but them to eased up. For the rest of today and now I am having light menstrual-like cramps that are coming and going but are irregular. I know they're not real contractions but they aren't Braxton Hicks either because this feels way different. I think they are pre labor contractions and I know if they are then labor can still be weeks away but I was wondering if there was a way to make them regular. I've done a lot of walking today and plan to do more, but can sex do the trick? Anyone have pre labor contractions and done something to make them regular like sex or walking? Did it work? Any advice would be greatly appreciated. Thanks!