"was a day late starting my next pack of birth control and did not double up, and then was 6 hours late for that friday&#039;s, had a condom break the next day and immediately ran to get plan b. no side effects. as unlikely it was that i could be pregnant, i stressed majorly. missed a pill a week before my period was due and begin to have brownish breakthrough bleeding. google of course told me brown blood a week before you period is implantation bleeding. the breakthrough bleeding did not stop until the day before i got my period, and then i got my actual period on the expected day. please please please don&#039;t obsessively use google, it will only worsen things. just pray and don&#039;t worry yourself sick like me. best wishes!"