Waiting AF

My 1st round with letrozole didn’t work, so now I’m waiting to AF to show.... have all the pms.. and all of my PT’s are BFN i kinda expect it.... anyway I’m irregular, due PCOS but i don’t know if the letrozole can help to regulate period..... Do any of you irregular and after taking letrozole got regular period and start again for next round??? Thank you..