2 months ago i missed my period, had dark brown stretchy discharge with light cramping. the same has happened last and this month. on bc. am i ok?

Birth control: Missing a period while on birth control can be common. It depends on what type of birth control you are using and the dosage/strenght. The longer you use hormonal birth control the less heavy your periods will be and with less cramping. Have always in mind that even on b/c you can still get pregnant. So if suspected perform a pregnancy test. If still with symtomps see your gyn for evaluation.