31+4 cramping

Tessa

So basicly what the title says, I just came back from taking my other kids to school and on the way back I started getting cramps from the bottom of my belly button to my vagina, kind of could feel it inside my vagina. Doesn't last but maybe 30 seconds then stops for a few minutes and starts back. Is that normal for how far along I am or should I call my doctor? Ftm.