The timing is a bit too early. More important, the appearance of lesions of intial herpes lesions is very different than shaving nicks. If the marks look like shaving nicks, that's what they are.
Can the nicks be a result of herpes from exposure this soon?
Welcome to the forum. Thanks for your question, which arrived while I was logged in. Most users shouldn't expect real-time replies!
The STD/HIV risks from oral-anal contact (rimming) have never been formally studied, but all the available evidence and biology of the STD bacteria and viruses suggest very low risk. The primary risk from rimming is for the oral partner, for garden variety gastrointestinal infections that result in nausea, vomiting, and/or diarrhea. It is likely there is no risk at all for the anal partner for gonorrhea, chlamydia, HIV, or hepatitis. Even when these infections are present orally, they typically are deep seated in the throat, and not transmitted in saliva or by tongue contact. Syphilis and herpes in theory would be higher risk, but still very low.
Oral sex also can be considered safe sex, especially for the penile partner. The risk of STDs isn't zero, but it's much lower than for vaginal or anal sex. In the absence of symptoms, testing generally isn't necessary after such exposures. I will also add that many escorts -- expensive female sex workers by appointment -- have very low STD/HIV rates; they know how to protect themselves and often are tested frequently.
Your shaving makes no difference. There is little if any increased risk of STD transmission by saliva exposure to shaving nicks or other minor skin injuries.
STD symptoms -- discharge, sores, etc -- can occur as soon as 2-5 days after exposure, usually with 10 days, and rarely up to 3 weeks. In any case, in the absence of symptoms.
All things considered, I don't think you have anything to worry about. If somehow I were in your situation, I would not get tested for anything and would continue unprotected sex at home without fear of infecting my regular partner.
I hope this has helped. Best wishes-- HHH, MD