Advice.

All this past few days I've just been spotting like only when I wipe maybe a small smear in my panty liner. It's never bright read brownish to a dark pinkish. I have irregular periods but it's never this light. Never this just weird. It usually 4-5 days of medium to heavy bleeding. I have had unprotected sex but I don't think I am pregnant. I took a pregnancy test and it came up negative, unless the spotting throws it off. I don't know. It just is baffling. 🤷🏼‍♀️