First day of cycle? Please advise

lilly

I have a quick question - yesterday afternoon when I checked my cervical mucus it was bright red and it was clear my period was starting but when I wiped nothing was there for the rest of the day (so only when I did a CM check). This morning when I went to toilet and wiped the blood red blood was on the toilet paper. So my question is what day is the first day of my cycle? I have to start my next round of clomid on day 2 of my cycle and want to be sure I take it in the right day. TIA