I had a similar pain when i was only a few weeks pregnant. It felt like AF cramps to me.....is that sort of what it feels like? It was a dull pain, kind of annoying.
I went to planned parenthood to have a pg test, and I told the nurse what I was feeling. I didnt know what eptopic was at the time, but she explained to me , that it COULD be exactly that. Luckily it wasnt, and it was only my ligiments stretching, as my uterus got bigger.
Most likely thats what you are feeling, are you ligiments stretching, you may feel it through your whole pregnancy. When yha think about it, youir uterus is the size of a walnut till theres a baby in there,your muscles have to accomadate your growing uterus and baby.
I wouldnt worry, but make sure you mention it at your first doc appointment