Hello, I started my most recent pill pack three weeks late, and a few days in to my active pills, I get some very minimal spotting, then my period all at once and extremely heavy, and for longer than usual. Before I started BC, they usually lasted about 4-5 days and the severity of it waned at the very end. I am now on my 6th day of it and it is still very, very heavy. I realize it must be a side effect for not having been on it for three weeks, but is there any cause for concern? I have been taking the pills regularly and will continue to do so. But this did not happen the first time I started taking them. In fact, I've been happy with the pills until now. Six days of disgusting blood/tissue loss have made me very tired and cranky.