Ladies, I need some advice.

Be
For awhile now on and off I've just felt some pressure (little uncomfortable but not really painful) in my abdomen and it's been going on today, along with a random cramp that's so light it feels more like a tap tap. I'm going to call my doctor tomorrow to ask about this, but have you ladies experienced anything like this? It's my first pregnancy and I'm 15 weeks 1 day.