Pulsating lower abdomen/ pelvic

I've very stressed out and reading online has made me more stressed about this. So I'm not sure if that's the cause. But I can tell when my baby feels me being stressed. Anyways let me start off by saying I know the difference between a hiccup and not a hiccup. I layed down on my left side, and it was my left side where I felt like a pulse. Every two seconds or so. It lasted for probably 5 minutes she moved around And it stopped. But what is this? Am I okay? Is my baby okay? I have a weird feeling... Please help. I'm a FTM.