I have been on the pill for awhile and got my period a few days early, could exercise bring it on early?

Anyone on the pill knows that you get your period like clockwork. I always know exactly when I will get my period and I got it a few days early. I am not on my fourth week of pills yet. I started exercising a couple of weeks ago. Could this have caused my body to get a little confused? I never miss a pill. I have only missed one pill in the past year. I take it at the same time every day.