I am guessing you mean birth control pills?
Usually you are supposed to take the pill the day after you finish menstruation.
With different pills, you have to wait a certain number of days before it is able to protect against pregnancy. Some take only a week, some a month.
I would say that to be safe, that you use another form of protection if you want to have sex other than the birth control pills for a month or so. Even after you should use a condom, so you have double protection against pregnancy and again std's.
can anyone tell me the calculation oftime as when a woman gets pregnant??
I really don't understand what you are asking here. Can you please make this more clear?
And welcome to the boards
Why does a rose represent love, when a rose always dies??
Friends are like condoms, they help out when things get hard.