Feel like he's trying to come early

Elicia
So for the last 3 days I've been having sporadic contractions and feeling period like cramps with back pain. I swear I feel my cervix doing something weird. Every time I have a contraction I can also feel pressure in my bum. I'm only 31 weeks. It's starting to worry me a little. I've been holding off on calling the doc cuz they only worry about me having contractions. Which aren't steady right now. But I live a hour away from my birthing place and I don't wanna travel there if I'm not in labor. Anyone else feeling this already?