I take i pill and after few days on 27 jan my period again start bt in the same month on 12 Jan period hppn i jst ask when in feb. Period hppn

in a month period hppns two times aftr a week than it means i m not preg. Cuz i heard tHat in pregnancy period is not hppn and plz tell me that in the nxt month when my next period will??? Or in the next month it happns two times or one and by taking pill period happens two times in a month is normal or not?????? Plz help and thnks for the first questn of mine……