A little concerned? Popcorn feeling.

I'm approx. 5w2d today, and got my BFP pretty early (3 days before expected AF), everything has been seemingly normal. Today I did have light pink blood on tissue this morning (after intercourse) so that didn't concern me but about an hour ago I had more of a bright red on the tissue and light cramping in my lower abdomin accompanied with almost like a popcorn popping/bubbling feeling sporadically throughout my lower stomach. I've had two miscarriages in the past and I'm really hoping this one sticks, I'm just really concerned and have never felt something like this during the other two pregnancies. Anyone have any advice? I'm going to call my doctor tomorrow morning and see if she'll let me come in or have any reassuring words but I'd like to hear the thoughts from some of you ladies!