I will be 27 weeks and 4 days in a few minutes with twins and starting about an hour and a half ago…

I will be 27 weeks and 4 days in a few minutes with twins and starting about an hour and a half ago I got some weird pains. My lower back is hurting really bad and it gets worse every 4-7 minutes and I keep getting these pains in my stomach every once in a while that really hurt and it sounds weird but I can sometimes feel it in my butt when it gets really bad but it only lasts like 5-10 seconds and hasn't been regular so far. Also not sure if it's related but sometimes when they kick it hurts really bad. I don't want to go to the ER if it's nothing major but at the same time I don't want to brush it off and then it be too late to do anything if it is something. Anyone else have this problem?