Blood when i ?

This is a bit embarring but i masturbate daily and today i could not find and lotion so i did it dry and faster than usual and then i noticed that there was a little bit of blood on my hand and my semen was a little darker than usual. there is also a little twinge in the tip of my . I dont now whats happening but also there was no blood when i urinated later. If anyone could help me it would be much appreciated.