Had One night stand later used fleshlight and..

I was just wondering if you could get STD showable wound after 6-10 hours after sex?

I had sex around 04:00 i used condom all the time except the end because it took so long to cum. Later that day i used a fleshlight and after i used it i felt it hurt a bit at the place where you pull down the forskin, so idk if it was from the sex, fleshlight, or because she had something.

Am i just paranoid?