What Are The Side Effects Of Sprintec Birth Control?

HI I AM 20YR AND i JUST STARTED TAKING SPRINTEC BIRTH CONTROL DUE TO MY IRREGULAR PERIODS. LAST MONTH I GOT MY PERIOD TWICE AND MY MD DECIDED TO PUT ME ON THE PILL. i HAVE BEEN ON THE PILL FOR THREE WEEKS BUT I HAVE SKIPPED A COUPLE OF DAYS IN THOW COUPLE OF DAYS I HAVE HAD INTERCOURSE i HAVEN'T FINKSHED MY BIRTH CONTROL PACK AND AT WEEK 3 I HAVE MY PERIOD IS THIS NORMAL?