Opinions?! FTM here...

I'm 33 weeks, and all day I've been having tightening and Lower back pain that comes and goes with nausea, and then earlier I was talking to a friend and just felt something trickle down my leg. Pretty positive it wasn't urine, but I'm not 100% sure. 
I'm just really uncomfortable and I had a headache all day before this but had to be at a breastfeeding class.. Is this normal and do I have to deal with this for the rest of this pregnancy?? Lol