Quasense and omg

I started taking Quasense around the end of May , when I first started taking it I was perfectly fine for the first month . Well I came on my period at the end of June which I wasn't expecting because your periods are only suppose to come every three months and I had just had a period before I had started taking the pill. Since the end of June I have been on my period , it stoped for about an week and came right back. I called an clinician and they said for the first three months of the pill your body is getting use to the hormones so I want to know will it eventuall stop soon, or what is going on with my body ,and also is this normal?