Your encounter is low risk for std the condom does Provide some protection against herpes. The real risk here is anxiety you may even cause your self symptoms if you keep inspecting your self looking for them If I was you I would try to move on. Don’t search for symptoms on the internet you will never get a conclusive answer. If I was you I wouldn’t test unless you have a long term partner or you have some noticeable symptoms like discharge or blisters. Don’t let your mind wonder of every what if. You had PROTECTED SEX and that is low risk. If you do test make sure the time line is right and the tests are conclusive.
Condoms are there to protect. So unless they break or move, there is no reason to think you could have caught any STD.
The only possibility would be herpes if the person you had sex with had the typical lesions in the area around the genitals. In that case, because of the contact skin to skin, you could get infected. but you would have noticed if she had them.
All the best.