Had it twice. First in 2018 then last year.
First time had prostate tested; both blood and physical, had scan of testicles at hospital and nothing found, but given antibiotics and blood eventually went away. Doc said it just happens, and quite common, not one patient with symptoms presented to him had ever had anything dodgy, all times it just went away.
Blood back about a year later. Had another prostate test, nothing found, but doc sent me to hospital. By this time the blood had stopped, but went anyway, just in case. Consultant did the finger test, asked some questions, took a urine sample, and discharged me - said couldn't find anything wrong, said it sometimes happens, and not to worry.
So, get yourself checked, but don't worry as it's pretty common and almost always nothing to worry about. Docs WILL get you checked out asap. Scans, physical checks and blood tests are all still open.
Cheers.