I have had sex twice, used a condom both times.I was told by both girls before and after that they were both 100% clean of any STD's.I work out on a regular basis and have been experiencing picky pains in my testicles, I feel it may be from straining to lift or an irregular blood flow while working out.I've noticed on and off a clear mucus like fluid coming from my penis when I think about sex, I have been assuming it is just pre cum.Should I be concerned? I can't say I trust either girl, but I did use a condom both times.