Cum got on me my period was late not preg for sure but took planb 1hr after to be safe light spotting that day and now period shld i still worry?

No: If you have had a normal period (normal in length and flow) it is highly unlikely that you are pregnant. If you want to be sure, do a home pregnancy test. If you are having intercourse but don't want to get pregnant, its best to get on a regular birth-control pill or other type of contraception. Plan b is for emergencies and should not be used all the time. Best wishes!