Im taking the mini pill cerelle and this only happened last month been on for 3 month get my period twice a month i dont know whats happening to me?

Cerelle: Cerelle is a progesterone pill and is almost 100% preventive of pregnancy. Any progestin-only "minipill" can cause bleeding irregularities, so you may do better on a combination estrogen/progestin contraceptive and not have bleeding so unpredictably. It is important to take any contraceptive pill at almost the same time every evening, to assist in avoiding pregnancy.

Vaginal discharge: Any new, abnormal, or unexplained vaginal discharge should be professionally evaluated. Colored discharge (yellow, greenish, brown, etc) often means infection like an STD, if you are sexually active. See a doctor ASAP.