I'm so confused with my body

I haven't had a period since Dec 28th because i have pcos. I had sex on February 10th and 14th I took a pregnancy test maybe 4 days ago and it was negative. Now I'm having cramps, extremely nauseous and the past 2 day I've had light bright red spotting. Is my period coming or is it something else my friend keeps telling me I'm pregnant but the test was negative