The other girls have given you good advice. As long as your baby is having plenty of wet and/or dirty nappies, seems alert and doing well your milk supply will be meeting her needs at this point. How your breasts feel, whether you're feeling a let down and how much you express are not good indicators. Have you tried switching to a football hold on the cracked nipple? Another thing might be to try Bfing lying down. If you get through this it will get much easier for you and bub. It won't always be like this - your baby is still small and it's amazing how a bit more growth, some good support and advice soon makes this just something you managed. Big well done on getting to exclusive Bfing btw.