Birth Control Stoppign my period

Hi everyone! So i am starting the combination birth control pill on February 16th. According to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>, i’m supposed to start my period on the 16th. if i take my first birth control pill on the 16 and i’m on my period, will the pill stop my period until after the 21 pills or will i still have my period on the 16th and then have another one after the 21 pills? sorry if that doesn’t make sense, it’s kinda hard to explain