I am worried that I may give my partner any STI!

I am 30 yr male and had my first experience with a sex worker in a brothel 2 days ago. She did a CBJ & protected intercourse with me. We changed condoms and she did CBJ again - but towards the end she sucked my scrotum and area between the scrotum and anus (don’t think she did anything to my anus). She also licked my penis shaft without the condom covering it - but not the tip.
Before we started the girl said to me that she is clean and they have to be tested with regular blood tests to be able to work. The girl did not seem to have any cold sores or breakout near her mouth.

Should I be worried of catching any STIs?
How long should I wait before going to the doctor and what tests should I be doing?
How long would it take for any symptoms to show up.

Me and my partner have always been in a monogamous relationship and this escort is only the second girl I have ever been with. I don’t know what got into me to go through this! I am worried that I may give my partner any STI!