I'd suggest going to a walk in NHS centre as you'll get medically qualified advice. No need to explain that he was  a client, just a 'sexual partner'. I hope you get some reassurance there.

Thank you girls. Bleeding was quite heavy  I was shocked and didn’t ask him if he has done any checks last . He thought it’s coming from me but when he rinsed his mouth he knew is him. Anyway it was my regular, white British and married guy so I hope I will be fine but I will make my way tomorrow morning to the gym clinic.

Something similar happened to me, this was a blood vessel in client's lip which sometimes bleeds when he washes his face. He tells me he needs it cauterising. He had knocked it once at the end of a long booking, wasn't a problem and not a problem on 3 other long bookings. One booking however I looked down during 69 to see blood on his face, I thought it was me but was not it was his lip. I was horrified he is in a  job coming into contact with body fluids albeit heavily protected and most viruses would have died. He didn't realise however the implications, plus of course how does he know I'm clear? I am however very careful don't have any unprotected intercourse but do give & receive OWO.

Luckily had a GUM routine appointment lined up a few days later asked them, they didn't seem concerned, but offered me retesting after 6 weeks.