Should I go against what my OB says?

Lindsey • 20, married, and TTC for 1 year
She says cd1 starts on the day I start bleeding even if it's spotting. Well. I've been spotting for 2 days, and I'm supposed to be starting clomid on cycle day 3. EVERYTHING I am reading online says full flow is cd1. Not spotting. I don't want to mess this round up as it's my first clomid round! I don't wanna start clomid still spotting and have it mess everything up. What should I do?