Cramping

I recently found out i was pregnant. I’m not sure how far along i am yet. The doctor said based on my last period I’m 16 weeks (my periods are irregular, i don’t think I’m that far) i haven’t had an ultrasound yet.

Anyway, a couple hours ago i started having mild period cramps. Nothing super bad, no blood. Well, as the hours pass it’s gotten worse. It’s now my lower stomach and lower back. Also like in my vagina if that makes sense? I never had this happen with my other two pregnancies.

Is this normal? What do i do? I want to make sure my baby is safe!.