I'm scared of being wrong

I'm 36 weeks.

Having awful lower back pain and pelvic pressure.

Had some contractions that were painful but not consistent.

Had diarrhea a few times.

I am so uncomfortable.

Everyone keeps telling me to "just go get checked"

But labor and delivery nurses are so mean and I'm scared I'm not actually in labor and it's a waste of time and money:( I was 1cm dilated and 50% effaced 2 weeks ago.