HELP!!

I got diagnosed with Pcos about a year and a half ago . My husband and I have been TTC for 9 months with no luck :( Last period was in May and a week late but very light and two days . Took a pregnancy test a couple of weeks later and negative . Lately I've been feeling a little wierd when I lay down . It kind of feels like light thumping in different parts of my stomach . Is this normal ?