How long did af last on letrozole?

Hi ladies so i was on provera to get my period.. now I’m on cd6 and take letrozole days 3-7.. af wasn’t too bad the last few days but is very heavy today. With tomorrow being my last dose I just thought it would’ve been almost gone by now? Has anyone else experienced this? Just wanted some insight on how that worked for everyone else and if that meant maybe this cycle wasn’t working for us. TIA :)