Hi no that would not be a symptom of any std that may have occure from the 3 months affair.
Correct probably not. and even with outside symptoms like blisters, they would appear about a week or 2 later not 3 months.
You can rule chlamydia from the oral sex as its not tramsmitted that way only gono and even with gono if no puss penis discharge and burning while urinating appearing about 7 days after exposure, you can pretty much rule that out as well. In my experince with gono, men will show symptoms as is a nasty bug to contract.