Anyone else??

I'm 29 weeks, third baby, and last night I had a lot of BH contractions and back pain and randomly started throwing up. Then today I've been feeling like I'm about to start my period. Its not so much as hard cramps just a weird achy feeling and it feels like I'm bleeding but there's no blood. Just like I have to keep going to the bathroom to check. There's no increase in discharge either. Not sure if its something to worry about or if the baby is just sitting a little lower. Anybody else felt like this?