Breast milk smells weird

Kris🐶🐶👶🏼
Idk what breast milk is supposed to smell like bc ive never smelled it befor i had my baby but i thjnk mine smells weird. Explaining the smell is rather difficult.
It doesnt smell sour necessarily but it doesnt smell super fresh either. Its definately not sweet. 
Im worried that theres something wrong with it and its going to make the baby sick.