It does happen. I've tracked a deer for a quarter mile bleeding only one small drop of blood every fifty yards.. Tracked it for three hours in the dark. Quit till morning. I even tracked it across a creek. Found one drop of blood on one side and searched the other side till I found One small drop. Found the deer about one hundred yards from where I quit the night before. Coyotes had almost ate the whole deer in about six hours. You just have to keep at it. Hope all goes well next time. Best of luck.
Live it up! Doug