If the mess you are talking about is clomid, my doctor told me to count any spotting before my cycle (the kind of spotting you know leads to a real flow) as day 1. But in saying that each doctor is different some say to wait to start counting until a real flow start some says to start counting at any sign of blood. I would suggest that you ask your doctor which he/she wants you to do. Hope this helps you, and good luck!
*meds not mess. Sorry about that.