period like cramps

Abeer
Hey ladies! 
I'm currently 38 weeks, due Dec 1st, so far everything has been going great. Today has been a bit rough as I've been experiencing period like cramps in my lower back, stomach and vajayjay. The discomfort isn't "timed" as much as it is constant, I've been staying active and staying hydrated. I'm not sure if this is an early sign of labor or just normal fatigue and pressure? I see my doctor on Monday