34 weeks lower back pain and pelvic pressure

So I'm 34 weeks last night my lower back started cramping up and this morning it still continues with pelvic pressure. Last night I felt like I needed to go number 2 but nothing would happen..

I'm nervous bc last appointment I had they told me my fluid was higher then it needs to be.

What should I do is this normal..

I've never went full term I had my twins at 34 weeks.

With them I never felt contractions but I was having them. I just don't want to miss laboring signs