Could I be pregnant ?

Hi everyone so the last time I had sex was about two months ago, it was protected sex for the most part but at the end we stopped using a condom and did it raw. He didn’t cum at all but I’m sure if he pre came. I took a plan b pill but ended up not really needing it since I ovulated the week before I had sex. So my period after taking plan b was normal and heavy like usual however I had my period about two weeks ago, and it was lighter than usual so that gets me worried. Now i went to the bathroom and checked that I may be having my period again. As it shows on the pic it’s really light. I’m not sure if it’s coming again since it wasn’t normal before. I’m experiencing my normal pms symptoms. I did take a pregnancy test two weeks ago and came back negative, could I be pregnant? also just for info. My periods have been irregular for months now so a period early isn’t that surprising but I’m not sure if it’s implantation bleeding or not. Please help!