Period at night, CD1??

Question

My period started around 7:30 (full flow) 
Is CD1 today or tomorrow? Need to know for letrozole because I start it CD3

Answer

My periods always start at night. Every doctor is different but my doctor told me to count when i started as day 1.. no matter what time of day i started

Answer

It would be day 1

Answer

My doc said my first day of full flow.

Period at night, CD1??

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