Clomid 7 day treatment

Hannah

I have PCOS and was prescribed clomid 50mg today by my OBGYN. I started my period on my own yesterday 2/9/2020. So I start it tomorrow! Praise Jesus!! However, I was prescribed 7 days so I take it cycle 3-10. Anybody know the reasoning for this? I left and didn’t even process that he said 7 days, because I was just so excited to be prescribed the medication itself lol.