Well, unprotected vaginal does have risks.
You can test for gonorrhea, chlamydia and NGU at 5 days.
You can test for HIV at 28 days if it is a 4th gen DUO test.
You can test for syphilis at 6 weeks.
You can test for herpes with a type specific IgG blood test at 12 weeks, but if you don't get symptoms, you might reconsider this. There are a decent amount of false positives on the hsv2 IgG test, and it can be very tricky and expensive to unravel that.