Early pregnancy symptom,??

I've been having cramps in the top of my vagina lately. Just random out of nowhere and last only a couple seconds, is this an early pregnancy symptom, or should I be worried about anything? I have been pregnant 4 times before but I didn't carry full term, I had cramping like that as well with my first pregnancy, I Don't know if it's normal or I should be seeing a doctor about it, any advice?