HELP! Constant cramping

I'm 26w 2d and for the past 2-3 days I've been having constant cramping in my stomach and lower back. They aren't unbearable cramps, I can tolerate them. More of an annoyance. But Once in a while it gets a little worse and I'll get a sharp throbbing pain near my pubic bone area. I don't think they have actually "stopped" yet. This is my 3rd pregnancy and Ive never been this uncomfortable until the end of pregnancy. Is this normal? Should I be worried? I've been trying to stay off my feet and drink more water but it hasn't been helping