pill & period??

okay so i just started the pill on sunday (i did the sunday start method) and i had gotten my period on the friday prior to when i started the pill: so i was on about day 2-3 (depending on how you count the days) when i started the pill. my period usually lasts about 5 days and today (wednesday) the period is still going. it obviously isn’t as heavy as when i started but i just am worried that its going to be really prolonged and annoying. is this common? and for those of you who have been in a similar boat as me, what happened with you? thanks so much lmk :)