Light bleeding after using boric acid?

Luna

Hello, so I use boric acid after my period whenever I feel like my ph balance needs a “reset”. I have never had this issue before with boric acid, but after using it after my last period, I have been spotting, like the pic below, for 3 days now. No other symptoms present. I am panicked because I know it’s not related to pregnancy or std because I’ve tested negative. Could it be that boric acid is causing this bleeding? 😣