First Femara cycle help please!

Monique • Married June, 16 2018 after 11 years together ❤Miscarried our Angel Baby at 6+5👼 Rainbow baby due 02 April 2020 🌈

Hi ladies, I hope you are all well. I have just started my first AF since my D & C on 12/12 but it is super light and my OB has prescribed me Femara to take CD 3-7. My question is does it matter how light AF is? Is it safe to say as long as I am bleeding on CD 3 I can take Femara? Any assistance is appreciated! Thank you in advance and baby dust to you all!!