Could this be implantation bleeding or just from sex?

It’s been a week since my period ended and I noticed while on vacation with my boyfriend that I had light pink spotting only when I wiped after using the restroom. It lasted a couple days but wasn’t always there every time I wiped, just a few times. We did have multiple rounds of intercourse but nothing rough or out of the usual for us. Could this be implantation bleeding? He’s always pulled out but of course we both know that’s not 100% safe