How long does it take for the pill or Depo-Provera to work?
The pill is effective two weeks after you start using it. It basically shuts off your ovaries. As long as you remember to take it at the same time each day you will be protected from pregnancy. The Depo-Provera shot is effective about 24 hours after it is given (within the first five days of your menses), even if it is the first time getting the shot. For more information about the birth control pill click here, for more information about Depo-Provera click here.
