I am ten days late on my period, but I have just taken a pregnancy test and it came up negative. Why am I so late? I lost my pack of birth control midway through a cycle, and have not been on it since. I waited a week to get my period before I restarted,

Your . Your missed period is likely due to the interruption and resumption of your birth control pills. It will take your body some time to adjust to the hormones again. Try to take the pills exactly at the same time every day in order to avoid this in the future. If you can't remeber to take pills or don't like the daily obligation there are other birth control options like the ring or depo injection. Please discuss your options with your doctor. Good luck.