i’m currently freaking out

so i had sex for the first time a month ago but we used a condom and he didn’t finish in me. other than that we never had sex after. since then i’ve been getting nauseous, sore boobs and a few other things. i was supposed to get my period today and about 30 minutes ago it looked something like pink spotting but i’m not sure, and i know that means implantation bleeding and am expierencing the usual cramps i feel during my regular period. i just was positive i wasn’t pregnant. is it possible i’m not?