spotting? implantation?

so i’ve been on the pill for 1 year and recently switched to a higher dose. this is my second pack on the higher dose and i’m close to the placebos. however when i peed i saw brown when i wiped. there was also some in my liner. do you think it could be implantation? there hasn’t been any cum inside of me. we had rough sex yesterday, but i usually don’t spot after. could it be me still adjusting? last pack i didn’t have any spotting. don’t know. thanks for any advice given!