Is Early Period Normal Whlie Consuming Birth Control Pills?

Hello! I have been on birth control for 9 consecutive months and have taken it at the proper time every day. I am not on any medication. I have never had any breakthrough bleeding or spotting, however this month I have gotten my period an entire week early where I still have a week left of hormone pills. This has not happened to me before. I am sexually active, although my partner does not ejaculate inside me. Is this early period normal?

Thanks!