Medicines that keeps a woman from getting pregnant.
If a girl has her period it all she is not pregnant. Irregularities in when the girl starts her period are a natural phenomena. the only way to control is, is by using the anticonception pill, but "the girl" has to see her doctor about that.
Stop smoking it.
No! But they can get pregnant as soon as they have babies.
Soon as you feel your body changing
Yes, as soon as you ovulate you can get pregnant.
after seven days of stoping the birth control completely runs out
as soon as possible
Yes.
Probably as soon as you have your period again. My grandmother got pregnant with my aunt a month after having my father.
as soon as you think you are pregnant.
You will be able to know after 2 weeks.