Terrified About HIV From Semen Toucing Fresh Bleeding Cut

Two days ago I gave an old man a hand job and he ejaculated on my hand. After returning home I saw that I had a small cut under my thumb which was having a little blood and ooze liquid. I don't know when I got this cut and I am not sure if his semen might have touched it. Now my mind is thinking the worst possibilities and I am going nuts thinking what if he might have directly ejaculated into this fresh bleeding cut. I don't know about the HIV status of this old man. Taking the worst case if his semen directly landed on my fresh bleeding cut and he being HIV + ve what are the chances of me being infected? Any detailed explanation is highly appreciated as I am going nuts thinking about the whole scene over and over again.