Hi. Im Using Canesten Tablet Every Night. On My 5th

Hi. Im using canesten tablet every night. On my 5th tablet i put this before i go to sleep. When i woke-up im bleeding. I dont know if this is because of canesten or menstration. Because my normal menstration is every 1st week of the month. Should i continue remainining 1 tablet this night or no? Thanks.