If you had a sexual encounter with a condom on there is not too much to worry about. It's true that STDs like herpes and syphilis can be transmitted even when condoms are used, but your skin should have got in touch with the lesions left on that person's lips by any of those infections. If you didn't see any blister there is no reson to think that person had any of them.
Regarding fingering, STDs are not transmitted that way.
No test is needed.