Have been in a monogamous sexual relationship with my girlfriend for a year now. Always use a condom except one occasion five/six months ago, and neither of us have any history of STDs, and this is a first sexual relationship for both of us.
Last Friday we had sex, but with a condom lent to us by a friend, and whilst wearing it, it felt tighter and less lubricated than the ones I usually use, although I don't remember any pain of chaffing during the intercourse at the time. Yesterday (Monday), I had slight muscle ache, which I put down to an over-strenuous day of work on Sunday, and this morning I found (although have felt the effects of since the weekend) a small pink sore on the base of the shaft of my penis (mostly hidden beneath hair). It's about 1mm wide and 2mm long, and just looks like a small section of skin has been worn away. It doesn't hurt unless touched directly, or I directly apply water to it, and only feel it itch when the skin is moved/pulled, causing it to stretch.
I have spent most of the day looking up STDs and symptoms and online, and due to the muscle ache and the fact that it looks a bit like an open sore, have led to me to believe that I may have caught herpes. Could someone either clarify whether it is likely that I've got herpes or set my mind at ease?
Thanks.