Pre seed bleeding after use

Ash

Used pre seed for the first time last Friday and Saturday. Today at work I felt a gush like you get when your period starts. Went to wipe and there was light pink tinged when I wiped. I’m home now hours later and still see some scant bleeding.

Anyone ever experience bleeding post pre seed? That is the literal only thing different I have done this cycle. I’m 4 DPO.