Your question is somewhat vague, but it sounds as if you might be having break-through bleeding from your pills, if it persists, contact your health care provider to see if you might need a different pill. However it is not uncommon to have some irregular bleeding when starting the pill ot may go away with time.
It really just depends on what type of birth control your taking, and when you start to take them. If you missed a week or two after getting off your period then you may spot for a few days, but you should start when your supposed to.
Your period will last between 2-7 days.
You will experience a withdrawal bleed first and your period will arrive 4+weeks after this.
Birth control pills do not make your breasts grow.
Not usually. They make then lighter and not as long.
There's no need to wait.
That is perfectly fine as long as you start your first dose on the day that is instructed. If that happens to be during your period. it should gradually get lighter and that eventually stop.
As long as you have not skipped any pills and start the new packet on time, yes the pill is effective every day during and after your period.
When you take birth control pills, you will have your period arriving during the 7 days break. During this time your period may last between 2-7 days.
In the next ten days.
Get checked for anemia or get put on birth control
As long as you aren't nursing anymore, you can start whenever, here's the catch. If you start your birth control right after your period it is effective almost immediately (check with the brand of pill you are using) because ovulation hasn't occured yet, if you start the pill any other time it is not considered effective until after your next period as ovulation may have already occured thus you could become pregnant, again.