Most birth control methods recommend that you use protection for at least 7 days when starting the pill for the first time. However, some say that if you start when your period starts you are protected right away. Since you started on the third day of your period instead of your first though, it may not be effective right away. You may want to get plan b just in case. If even one doctor tells you to get the pill, I would take their advice. Better safe than sorry.

It's wonderful you are doing all you can to stay safe and protected