Very late cycle help

Marissa • Mama 🥰

Hi ladies! I was finally given a perscription for Femara earlier this month to start on day 3 of my cycle. My cycles are always irregular but this month (of course) it is SOOOOO late. I am on CD 44 and my average long cycles are between 35-38 days. I tested and BFN every time. Should I keep waiting for it to arrive, should I call me RE again?