Birth Control question...?

In the past few months I have noticed some changes with the way my body reacts to my BC. I have been on it for over 1 year and recently on the second week of my pills I bloat as if I am going to start my period and my ovaries ache or I have cramps. Of course this automatically makes me think that I may be pregnant and then I remember that it does this to me every month. Any answers that may help this conundrum of mine? Thanks for any answers in advance!