Alright, not easy situation, but “odds” don’t matter.

Wait the required time before getting a test (it won’t detect it too early), then take a test. I don’t know how long that’s for each STI. If you suspect you may have some STI, abstain from sex and blood donations, and contact people you’ve had sex with recently. Embarrassing but responsible. If you’ve recently donated blood, contact the donation center ASAP and explain the situation.

Lastly, don’t trust LLMs’ output. They have no idea what they’re doing, it’s just text prediction on steroids. Always ask it for sources and check those if regular search engine doesn’t work. Especially not for medical questions for fucks sake.