Hi I have started a new pill this month Mercilon (21dys pack) due to I have endometrioma ovarian cysts my gyanea gave me 4 months time on Mercilon to check if the cyst progressed before doing a laparascopy. I had 1 day of very light pink bleeding twice in a day and the next day I started my period so I started the pill when I saw the actual red bleeding but now the period hasn't stop yet it's 10 dys now very heavy flow. Should I keep taking the pack or be concerned in any way?? Thanks in Advance.