I have been taking my birth control pills n I miss one of my periods on the day I was supposed to start and well  I didn't started I was  12 days late. Out of no where I felt a really bad pain like if I really need to go to the restroom my dad was in there so I waited with pain while grabbing my stomach I had never had a pain like that once my dad got out the restroom I went in pulled down my pants and I was on my period like really heavy and on the pad there was something that was like meat pink some what reddish I don't know what it was so I would like to know because when that happen I still continue  to take my pills but have been having pain while standing up and laying down I only blended heavy for 2days and the third just alittle bit and my period went away but the pain is still there while I go to bed or stand up