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If you are taking one of the pills that stops monthly bleeding it should be effective the first month, if you started taking it the first week of your period. Otherwise BCP react differently in different women.

Some women will stop having a heavy flow the first month, others it may take several cycles to make a noticeable difference. Some women will stop having any monthly bleeding - from using 21 day packets.

Many women have "break through" bleeding off and on for the first two or three cycles - this is any irregular, light bleeding that may last several days or may come and go. (It is perfectly normal as your body adjusts) If this lasts more than three cycles or is heavier than your normal period, talk to your doctor or family planning clinic.

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Q: How long after starting birth control will it affect your period?
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Related questions

Will starting birth control in the middle of your cycle delay your next period?

Starting a hormonal birth control pill in the middle of your cycle is likely to delay the next period.


When you stop taking birth control will it affect your period?

Yes


Does starting birth control in the middle of your cycle delay your period?

Starting birth control in the middle of your cycle can cause some irregularities in your period, such as spotting or changes in timing. It may take a few cycles for your body to adjust to the new hormones, so a delay in your period is possible in the initial months of starting birth control.


Can starting birth control pills after giving birth trigger your period?

Sometimes yes.


While using NuvaRing can stress delay your period?

Stress is not likely to affect your period when you're on hormonal birth control, as the medication "takes control" of the hormones that affect your period with stress.


Will starting birth control pills before period delay your period?

Starting the pill before your period may delay your period, but you may also have breakthrough bleeding during the first three cycles. If starting the pill before your period, use a back up Birth Control method for the first seven days.


Can new birth control affect period?

Yes, birth control can effect your period. It messes with your hormones, so it can make your body go out of whack like messing with your period or gaining weight.


Will starting the birth control pill before your period delay it?

Starting the pill before your period may delay your period, but you may also have breakthrough bleeding during the first three cycles. If starting the pill before your period, use a back up birth control method for the first seven days.


Can you suppress a period by starting birth control less than a month before vacation?

Hi, You can stop your period from arriving by continuing to take the active birth control pills.


If im starting to take your new birth control pills and your period comes on the 14 but you started taken them on the 12 will that stop your period?

Answering "If im starting to take your new birth control pills and your period comes on the 14 but you started taken them on the 12 will that stop your period?"


How soon can you start your birth control pills to get your period early?

Starting the birth control pill will not cause an earlier period. It will delay your period. Talk to your health care provider or pharmacist to clarify what you should do next.


Does penicillin affect birth control?

Penicillin does not affect birth control.