Breastfeeding question

This is my first time trying to breast feed so my latching wasn't perfect and I end up with a sore red blister on my nipple it went away. I decided to used a breast pumped and pumped and in my right breast my milk was fine but when I went to pumped the left breast I notice blood in my milk and I'm worried I don't know if it normal because I never breastfeed before until today!