My clinic doesn't count CD1 until you have had a full day of AF. I got AF on a Friday, but not until about 2pm so they didn't count my first day until Saturday. Likewise what N2L said - I started injections day 4 too.
Was that cycle successful? How many follies did you get? Full flow arrived for me about 4pm, so I guess technically monday is CD3. I'm just a nervous nelly .