Help with period

This might be TMI but I spotted in the 21st and nothing in the 22nd. The night of the 23rd I had one big gush and then gone. On the 24 it was heavy all day then the 25 it was very light. I spotted very little on the 26 in the morning and night but all during the day it was gone. Today nothing. What would be my first day of my cycle? I tested to see if I was pregnant but BFN.