Implantation bleeding helppp!!!!

Najra

So i have PCOS I’m 24 years old typically I do have irregular periods but I do get AF about 10-12 times a year I’ve never went without period longer than 2months. My last period was December 7 2018, typically my cycles are between 30-38 days, so I was expecting a period around the first or second week of January. Instead on the 7th of Jan I started having light spotting which is how my period starts so I thought that’s what it was until the light pink and brown spotting continued until the 18th of Jan, I had no cramps, I was feeling nauseous and light headed didn’t have my normal pms symptoms. I took a pregnancy test on the 14th of Jan came out negative. Now that the spotting has stopped I’m having minor dull aches near both ovaries and in the middle of my belly, I’ve never been pregnant before and I’m ttc. Can someone please give advice implantation or cyst ?