Hi Dileepa,it is safe to have unprotected sex anytime during the cycle if the pills have been taken regularly over time.Still, for the pills to be fully effective following guidelines should be adhered to. The first pack of pills should be started from preferably the 1st or 2nd day of the cycle, the first day of cycle being first day of menstruation
. If it is started within the first 5 days of the cycle, no other back up method of contraception
is required. However, if it is started after the 5th day, a back up method like condom is required during the intake of first 7 active pills.Once the active pills are started they should be taken without a break ,at preferably the same time, every day usually after meals. At the end of 3 weeks she will start the placebo pills. After 3 to 4 days of the placebo pills ,she will have her periods and she should start the next pack in continuity of the old one the day after the last placebo is taken. If the periods are delayed by 7 days she should get a urine pregnancy
test done. If she misses one pill she should take it as soon as she remembers or two pills together the next day.If she misses two pills consecutively she should continue the pills as usual but you should use a back up method for the next 7 days along with the pills.