I have been on the pill for 3 years but spotted one day a week before my period is due this possibly implantation bleeding what are chances of being pregnant?

The chance of pregnancy while taking the birth control pill is very low, but it is still possible to get pregnant. The birth control pill is a very effective method of contraception, but it is not 100% effective. There are a few reasons why you might experience spotting one week before your period is due, even though you are taking the birth control pill. One reason could be that you are experiencing a breakthrough bleed, which is a light bleeding that can occur in between periods. Breakthrough bleeding is common in women who are taking the birth control pill, and it is not usually a cause for concern. Another possibility is that you could be experiencing implantation bleeding, which is a light bleeding that can occur when the fertilized egg implants in the lining of the uterus. Implantation bleeding is also common in women who are taking the birth control pill, but it is not as common as breakthrough bleeding. If you are experiencing spotting one week before your period is due, and you are concerned about the possibility of pregnancy, you should take a home pregnancy test. If the home pregnancy test is positive, you should see a doctor to confirm your pregnancy.