What Could Cause Strange Smell In Nipple While Pumping Milk?

Hi, My name is Anca and i am 1 year old s baby mother. I am still breastfeeding and the thing is my baby nurses just from one breast since 9 months lets say.The other is just pumped ,it has not to much milk in it so it is not getting to full,i pump it three times a day.I must say my milk is getting lower now anyway in the other breast too but i have a question..i noticed since yesterday when i pumped the breast she is not nursing at it has a strange smell,not very bad but weird i never had this before.The other one now but just this one.When i smell the bra it is not to much there but i think the nippel smells like that.The thing is i am a little trapped with baby home so i can t go to my doctor to soon but i got really worried with this.Can it be an infection or something like this?does it affect the milk?it is hard to tell like this but maybe i can get an answer please or should i see a doctor for this.Thank you