Random spotting question


I have like 13 days until my next period and Noticed s light pink discharge. I’ve never spotted before and don’t know why I am now?

I have 3 kids and took a pregnancy test (negative) because my Boobs have been super sore and I drank twice in the past few days and threw up both nights.

What are reasons for spotting? Should I make a appt with my dr?

Thanks everyone!