femera

anyone start femera on cycle day 4? last month I started day 5. when I went in for my scan yesterday (day 3) the us tech said there was a good size follicle on my left ovary (my right tube is blocked) she wasn't sure if it was a cyst or not but they would check my blood work for estrogen. I got an email from a nurse telling me to start my femera this evening. just wondering I see most people are either day 3 or day 5 to start. this is my second cycle of femera, the ovidrell trigger and prometrium.