Why did this happen?!?

Ugh! I got my first positive ovulation test on July 30th and had my peak day August 1st and then was done by August 3rd ( so 4 days of positive opks) I am now 5dpo and I started spotting yesterday afternoon 😭 and it's kept up pretty steady into this morning. No cramping or clots. It's not really getting heavier but it's just steady a light flow. How can I get my period this early?! Makes no sense to me.