Is this a sign of pregnancy

I need help trying to figure out if I’m experiencing signs of pregnancy or if my bc is just not right for me anymore. I’m on the pill and have been for a bit under a year (have a tried a couple). In the last 2 weeks I’ve had sex with out a condom quite a few times. The other day I started spotting and have been ever since. I’m concerned this may be implantation bleeding but I should only be coming up to my fertile window now. I’m due for my period in a little under 2 weeks and this bleeding is barely even bleeding and looks different to a normal period. I know it’s too early to take a test but I just wanted other people’s opinions on whether or not I should be concerned or if this is just a bit of break through bleeding