Help!

So yesterday I was breastfeeding on my right side and I felt he was not latched on correctly so I took him off. I use a great shield because I seem to have shy nipples but I noticed there was blood in there. Now my nipples is chapped and will bleed if he goes at it again. But I really need to use my right breast since I'm starting to ache a bit but I'm scared to use it because of the blood. What do I do?