CYCLE, WTH! Lol Thanks ladies, you are great!?

So I was wondering, if my cycle is lets say 28 days, does that start the day I start my period? Or the day I ended my period? I am wondering because Last month I had a period march 4-7, than another one from the 19, and only spotted for three days, than had a flow til the 22. So I haven't gotten my period yet, and not sure what day it is officially late? Any help is appreciated. My period in Febuary was on the 2-5. I have not had my period this month yet, does this mean I am late? In Feb., my fiance and I had unprotected ( we do every day some times twice a day, except during period) and he d in me, than at the beginning of March I received my period which lasted five days compared to the regular seven. I was not to worried about that, but than I used the restroom on the twentieth of March and when I wiped there was pink blood. This continued for three days, only when I wiped, than on the fourth day I started a flow that lasted til the twenty fifth or so. I should mention, last week on monday, I went to the bathroom, and I wiped and there was a streak of blood, and nothing since. God bless ladies and gents! Thanks a bunch!