BIRTH CONTROL HELP

Mi
Okay so on Friday I went to the doctors and got prescribed for birth control and she didn't say anything to me so I was like whatever i know the basics about it. So when I got home that night I took it around 9pm and now I'm on day 3 and I've already taken it today but I was talking to my friend about it and she told me I was suppose to wait and take it after my upcoming period which is in about 10 days. What am I suppose to do stop taking them and wait or keep taking them?????