Hello,,, if you had unprotected sex and if you are worrying about getting pregnant, then you should take emergency contraceptives, like ipill. And you should take I pill with in 72hrs of the unprotected sexual intercourse, otherwise it is not effective. If you have taken it last also,, nothing to worry, it can be taken now. But frequent using of ipill will cause some side effects. So using condoms is free of side effects.