My girlfriend just told me that her period was late (by about 3 or 4 days). She says that her cycle is usually VERY predictable and she has NEVER been late for a period. She's on a 21-day pill I think (21 days on, then 7 days for the period), and the 7 days should have started on monday. This is her 2nd month of being on the pill. The last time she had the "7 day break" her period started bang on time, just wondering why it could be different this time. And it's not like we've had sex that frequently last month (maybe 6 or 7 times?). Anyone care to shed any light on this? Many thanks, Invic.