[Sincerely Yours ♥]

According to planned parenthood:

You may start the combination pill at any time. If you start within five days after the start of your period, you are protected against pregnancy right away. You will not need to use a backup method of birth control. That means that if your period starts on a Wednesday morning, you can start the pill up to Monday morning to be protected right away. If you start at any other time during your menstrual cycle, you will be protected from pregnancy after seven days. Use another method of birth control — like a condom, female condom, diaphragm, or sponge — if you have vaginal intercourse during the first week of use.

If you have started your period & have started the COMBINATION pill, you can assume you are protected. However, it might be best to have the extra protection for a day or two.

You may start the progestin-only pill at any time. Use another method of birth control if you have vaginal intercourse during the first 48 hours of progestin-pill use — protection will begin after two days.

But for the progestin pills only, you must use another form of protection for the first two days.