Possible implantation?!

Last Friday and Monday my boyfriend and I had sex. We used a condom both time, and I’m pretty sure he pulled out as well, but he might’ve not been telling the truth when I asked. I was having no early signs of pregnancy, but yesterday he came over and ended up fingering me. We noticed a really small amount of pinkish/reddish blood on his fingers. Could this be implantation bleeding or did he just scratch something??