I am on the qlaira pill and am up to the 19th day. yesterday i got my period and it was normal, today it is very heavy and black, what does this mean?

Did you miss pills?: Don't worry! "darker blood" at the end of your cycle is normal. It means the blood has been in the vagina longer, similar to when you're cut. fresh blood is red , but becomes darker after exposure to air. Do get std testing and an exam if you have pain with sex or urination, change in vaginal discharge, odor, itching, or a new sex partner. Remember bleeding on the pill is not a "period".