On friday, i realized that i didnt take my thursday birth control. so i took thursdays and fridays birth control at the same time. im on my period cycle now and nothing has happened yet. will my period come late now? has my cycle been thrown off?

Diagnosis of pregnancy requires a missed, late, or abnormally slight period. Did you miss a BCP at a time that you were exposed to pregnancy (Thursday)? If so, a pregnancy test will be positive if pregnant. If negative, use barrier protection until a period happens and then resume oral pill contraception, If your period does not occur within four weeks, have an exam by a trusted ob-gyn.

If bleeding started after a "missed bcp with two the following day" it is due to withdrawal bleeding from temporarily higher estrogen which should stop in a few days. Best is to stop all bcp's, wait five days and begin a new pack. Missing a pill will not result in pregnancy, but continuing a pack with a "missed" active pill will generally causes constant low level bleeding.