I took my period cycle pill a week before i should have now i have stated my period but only bled once shuold i be worried?

If you have been on the pill for over 4 weeks then perform a pregnancy test 3 weeks after you last had intercourse.

If you've recently started birth control, you need to continue taking your pills as normal but you need to use a condom for 4 weeks to prevent pregnancy. The same applies to the above.