Does Fluttering In Lower Abdomen While On Birth Control Indicate Pregnancy?

I am on birth control, I take it everyday at the same time. I have never missed a pill. And I have just started a new pack after my period, but I have been feeling fluttering in my lower abdomen for a few weeks and now it is more frequent. my breasts are also bigger than they used to be and my nipples are very tender. do you think i could be pregnant?