Is birth control less effective the week of your period?

No. Most birth control methods have 21-24 days of hormones to suppress ovulation & the week that someone is on their period is the time that no hormones are present in the birth control. You do not release eggs during this time. Menstrual blood is a sign that your hormones are dropping and no longer supporting the lining of the uterus.It would be rare for someone to get pregnant during their period.

Related Questions

Is birth control pill still effective if you get your period at a time other than the placebo week?

Breakthrough bleedin. Breakthrough bleeding (bleeding at the wrong time) is very common on birth control. It happens in about 1/3 of users. Its no big deal and usually self corrects over time. If you are not satisfied or it continues to happen then consider using a different birth control method. It is a common side effect and does not mean something is wrong or that the pill is not working. Read more...

How soon is the birth control pill Reclipsen effective after your period? (How soon into the new pack)

Starting BCP. Birth control pills should be taken a full cycle before they are considered to be effective. In the first month, you should also use an alternative form of contraception (condom). Read more...

Is it normal to be on your period for over a week when first starting birth control?

Period. Yes your body needs time to adjust to the hormones in the birth control pill. You may notice some spotting during the first three months. After this you should settle down. Take care! Read more...