I had sex in April on 18th and the same day I happen to get my periods. The next day I had ipill. Later in may again we had sex between 19th to 24th and I also took contraceptive pill. I checked for pregnancy in first week of may it was negative. I again checked it on 18th it was negative. Following I did not get periods the entire may month its 2nd June now. I had a pregnancy test again 2 days back it was negative. Is the cause of the missed period due to the pills? Or is there anything to worry about?

Any time you have sex pregnancy is a possibility. The emergency contraceptive is designed to be used on an emergency basis and should not be used for regular contraception. It can also cause a disruption in your period schedule.

At this point, your only option is to stop having sex and see what happens when your next period is due. You may want to consider using a regular form of contraception such as the birth control pill or the depo shot. Remember, though, that no form of birth control is always 100% effective.