If you have been taking your pills the ones you take on your period are sugar. You want to start the real ones on the day you stop. Usually the sugar pills are a different color. If you pills aren't this way take them on day two as given by the directions of your pills.
If you had unprotected sex on the 7th day (off the pill) or a day before you have 1% chance to be pregnant. Otherwise I would not worry. All the best.
Nothing
If the birth control fully works, there won't BE a fetus, birth control will do nothing about an impregnated egg or the baby that it will result in.
Birth control loses all of its effect the day that you stop using it.
You can get pregnant
There is no increased risk of pregnancy if you miss the non-active birth control pills.
Yes. In the first few months of being on birth control, this happens frequently, and it fades as you continue to use it.
Nothing
Sperm is not affected by hormonal birth control; it does the same thing it does if you're not on birth control, except that there's some decrease in how much sperm can get into the uterus (due to thickening of the cervical mucus). Hormonal birth control affects the egg.
No, the opposite happens you will ovulate.
The effectiveness is the same whether you take the birth control pill with food or on any empty stomach, but some women have nausea if they don't take the birth control pill with food.
yes it can. the birth control tricks your body into thinking you are pregnant. that's why you don't get your period for a while. the lactation part happens due to the hormones that the birth control have. so some lactation can occur.
no, because birth control (in any method: pills, ring, patch, shot, implant) is meant to CONTROL birth BEFORE it happens. they are useless after you're already pregnant.