You might need PEP, as you have indicated that you have been at risk of HIV in the last 3 days.
PrEP could be for you but you might need PEP (post-exposure prophylaxis) first.
You’re unlikely to be given PEP if your sexual partner has an undetectable viral load, is HIV negative or not from a group of high prevalence of HIV.
If you think that you might have been exposed to HIV, it’s important that you go to your local sexual health clinic (or your local A&E department if the clinic is closed) and ask for PEP.
PEP is a course of anti-HIV medication taken for 28 days to reduce the risk of acquiring HIV.
If you’re not sure if you’re at risk, this PEP quiz might help you decide what to do next.