Signs of Early labor?

Hey! So This is my third pregnancy and yesterday and today I’ve been having really bad cramps and pains on and off. They feel like “diarrhea” cramps, and I feel like I could have diarrhea but I don’t. I’ve also been having this thick jelly like discharge. Should I be worried? I’m 19 weeks and went into labor early with my first.

Thanks in advance💜