Birth control!

At 6 weeks PP I started the birth control patch, I was on it about three months and decided it wasn’t for me because I had issues keeping it on. I always had my period on the off week, besides it not sticking it was great. I asked my OB to switch me to a pill form that was close as possible with the active ingredients/hormones. I started the pill on the Tuesday I was suppose to start a new patch. Ever since starting the pill I don’t have my period during the last week of pills, I have it the week before. So I have my period during the third row of pills. Is this normal?