Strange smell when nursing

Er

So this is a bit weird- Does anyone else notice a strange smell just when you’re nursing? I swear I smell onions when I am nursing. I can be freshly showered and my son be perfectly clean and I still smell it. I’ve smelled my breast milk after pumping and it doesn’t have that smell. I have tried to figure out what it is but the only thing I can think of is his saliva mixing with the milk that produces the smell.