2 periods 1 month

Nic
Hi, im currently on birth control for 3 months now, my periods are some what always on time, but never have i had 2 periods in 1 month. 5 days ago my period ended, which i was on for 7days. Now i started my period again. Could it be hormones? Unbalanced?? I am on the pill. I had been trying to pregnant for 6 months before and the dr put me on birth control to help regulate my cycles. Whats wrong with me? Anyone else have 2 periods like this?