Prelabor?? Help

I’m 34w & a few days w my second! first time went into labor at 39weeks but at 36w I was already 2-3cm dilated. For the past two weeks I’ve had loose stools and still do occasionally it seems to have calmed down a lil. For the past week I’ve been feeling sickish like if my body is detoxing just a weird feeling! I’ve also been having period Like cramps very uncomfortable lower stomach and back. It’ll last for about 30 mins and it’s been like this for a few days. I’ll sometimes get the cramps several times a day. Did anyone experience this???