Hello and thanks for your query.
I shall make an effort to provide you with good professional recommendations specific to your questions.
Post coital pills are highly effective taken within 72 hours of
unprotected intercourse. I would not suggest you to do take
I pill or any other party coital pill, is you are having protected sex, these are
hormonal agents and they have their own side effect.
I would suggest you to use condom, you can also consider using spermicidal cream or jelly for more protection.
In case of missed period, I advice you to perform urine
pregnancy test, it is more sensitive if you perform it after week of expected missed period and also with morning sample of urine will be more sensitive.
Yet again, I duly appreciate your query to me, I do hope that you have found something useful to help you and I shall be glad to answer any further apprehensions.
Sincerely,