what is this?

so, I have irregular periods due to thyroid issues but I'm pretty sure I have PCOS as well due to a small amount of facial hair. I take ovulation tests every month. last thursday was the first one I took and it was half the color (test strip). i also started spotting that day. it was brown. i spotted on thursday and friday...it went away...and i started spotting again yesterday. still brown. it's VERY light and only notice when I pee and wipe. what the hell could this be? I've taken a hpt and its negative. could this be ovulation bleeding? i took another ovulation test today and its negative. I'm so confused.