I believe I've always had that, but it became really noticeable when I started with peri because of my anxiety and sometimes racing heart.
I was weaning myself off lorazipam (which was an hellacious experience, even after just 21 days on it-that's another story) and I was at my Drs. for another reason. He felt the pulse in my stomach and said we have that checked out with an ultrasound. I asked him why. He would only say that perhaps my aorta was a little different.
Of course in my panicky peri mode, I went home and looked up pulse in abdomen and just about keeled over when I found out what it could be (aortic aneurysm). I wasn't scheduled for the ultrasound until 14 days from then. I was just going through horrible withdrawal (read panic x 100 from what it was before the pills) from the lorazipam.
I honestly don't know how I made it through those 2 weeks. The woman at the imaging clinic asked me what I was there for and I told her for a pulse in my abdomen. I told her I hadn't slept in 2 weeks, and she took pity on me and told me right there and then, that my aorta was totally normal.
This happens to a lot of people when they're slim. You can actually feel the heartbeat in your abdomen. That's likely all you're feeling. I don't know if I can ever forgive my Dr. for having me go through 2 weeks of torture like that.
I think there's actually a way they can just listen to it with their stethoscope and decide whether it needs further investigation. You might want to ask your Dr.
Sorry about the long spiel. As a fellow peri person, I'm sure you understand that talking about our experiences helps