Starting birth control mid cycle to delay period?

May not work: If you start the pill after you've ovulated (mid-cycle) you may not be able to delay the period.However, many drs recommend a quick-start(any day--as long as back up is used for 7 d, and unprotected sex hadn't occurred earlier in the cycle) as a good way to start birth control.30-40% of women have irregular bleeding in the first cycle, even when starting the pill on the first d. So no guarantees.