8 days late on letrozole

Mikail • Married 🤵🏻👰🏼 2 step daughters 👧🏻👧🏼 TTC #1

Has anyone ever been this late after taking letrozole? My period is like clock work each month and I have never been more than 3 days late. I took a pregnancy test this afternoon that came out negative. According to my ovulation test I ovulated at my typical time as well. Looking for help on this