Hiya hun! I do hope you get the news you're hoping for. I have had a sorta similar experience when PG in my early 20's (a PG that never came to fruition). At around the 6 or 7 week mark, i had lotsa flutters in my uterus, and it did feel like something was in there. Before this 'though, I felt nothing. Although, during some of my TWW's whilst TTC of late, I've also felt like there may have been a bun in the oven, although there has not been (bummer!). I think when we are TTC'ing, we are 50 persquillion times more conscious of our little uteruses, and any little twinges we may be feeling.
Anyway, I really hope it's a BFP for you! Have you thought of testing? Some tests can pick it up this early (although a BFN this early doesn't necessarily mean you're not PG).
GOOD LUCK!
Arielle