Side effects of Gianvi Birth Control?

I have been taking this birth control since April and will be starting my fourth pack this Monday. The firs month I experienced my period regularly (the third white pill). The next month around the same time I had an extremely light period that could even be mistaken for spotting. I am supposed to get my period today but have yet to get it still and I am begining to think that it is going to be like the last month. Is this a normal side effect of Gianvi?