I started taking Marvelon 21 over a month ago. I followed the instructions to the letter and had my seven day break. On day 6 of the break I began to bleed. I began taking the tablets again on the correct day but the bleed is still occurring 5 days later. Is this just my body adapting to the pill. I also take 100mcg of levothyroxine on a morning (I take Marvelon on a night as specified in the info leaflet) so I don't know if this can have an effect. I started taking Marvelon to help regulate my periods.