I've been having on and off "period-like" cramping for the last week and a half. the last day and a…

I've been having on and off "period-like" cramping for the last week and a half. the last day and a half its been more of a constant thing. had a hard time falling asleep when I woke up to pee last night because of it and now that I'm awake I'm still feeling it. first pregnancy so not sure what exactly I'm supposed to feel here. went to ob last week and told the NP and she said it was probably just my uterus continuing to grow. just a bit nervous. anyone had this type of constant cramping?