I understand that you are worried, that’s pretty normal. A one time protected encounter is extremely low risk – I don’t have percentages but probably less than one in 1,000.
Shingles (caused by the varicella zoster virus) is a reactivation of the chicken pox virus. Varicella zoster and HSV 1 and 2 are in the same “family” of viruses but are otherwise unrelated. Where was your shingles outbreak?
The vast majority of people who acquire a new herpes infection, who are going to have symptoms, will have them by 2-10 days after the encounter. You are half way there. The symptoms that you describe, feeling soreness and tiredness in your legs, is not normally a symptoms of herpes. Sometimes people who already have herpes will feel some sensation down the legs when they are about to have a recurrence, but this is different than the symptoms that you describe. What you should be looking for are blisters or sores on the penis. I’m not aware that sexual position has any impact on acquisition, but it seems to me, just visualizing this in my head, that the position you describe might result in fewer vaginal secretions pooling at the base of the penis (vs female on top during intercourse) and thus present a little less risk, but that’s a wild guess.
I would imagine that the sex workers are not infrequently infected with herpes. And I have no idea if they are tested for herpes or not. When we have sex workers come to our clinic (which isn’t all that often, we do test them for herpes.)
Terri