Can i take birth control on my second day of my period when i didn't take it on my first day?its my 1st time using birth control.

2nd DAY OCP start OK: If you start 'the pill' on the first day of your period and it offers the best protection against pregnancy throughout the first month . If you start on the 2nd day or later some doctors would recommend a 'back up' method for birth control 'just in case'. You can also start a pill pack on a sunday and 'not have a period on a future weekend! ' --so you have options.