Family Planning Plus

It could be.  Not taking your pills for a week will certainly disrupt your normal cycle. Other things, like stress, illness, medications, and  lack of sleep will also alter your cycle. Your period may come earlier or later than usual. Keep in mind, your birth control was not effective during the time that you didn’t take the pills. If you recently resumed them, they may not be as effective while you’re taking the antibiotics. To be on the safe side, continue to abstain from intercourse until your next period, or use condoms.