You might be.
You should get tested.
You can test for gonorrhea, chlamydia and NGU at 5 days after the exposure.
You can test for syphilis at 6 weeks. If you get a sore, get seen as soon as possible after the sore appears, no matter when you see it. A syphilis sore can appear any time after 3 weeks to 90 days, but the average is 6 weeks.
You can test for HIV with a 4th generation DUO test at 28 days. If it's a regular antibody test, it can take up to 3 months.
You can test for herpes now with a type specific IgG blood test. If it's negative now, test again at 4 months.
Keep in mind that escorts use condoms to protect themselves from their clients, not because they are necessarily infected with anything. Chances are pretty low that you'd get infected, but test to be sure.