Are These Flutters a Baby

I have not missed a period but for the last seven or so months my periods have been very irregular, lasting sometimes a few weeks but they are very very light. I have done tests and lately they are all negative, I did have two positive tests in november but I had been bleeding a week before and therefore decided they were due to tablets I took to stop the bleeding and I only did one test to compare to a friends who couldnt decide if hers was negative due to a clear line, shock wasnt the word when mine had two pink lines and the following day so did another. I waited a week did another test and it was negative and every test afterwards was negative. I did have sore breasts at times, felt sick at times, heart burn but put it down to hormones. In the last few weeks I started to feel flutters and this week they have gotten stronger almost like little kicks, is it possible to be pregnant or can anything make you feel like something is moving inside your tummy.