How to bring up a sensitive subject such as strong female odor to my gf?

I can’t bring myself to go down on her and I really want to but honestly I feel like I could puke its soo strong. Now I understand it isn’t supposed to smell amazing and a little fish odor is ok. But this is too much I’m worried about her health as well. I’ve googled it several times and alot of times they say if it is a very strong odor its an infection. So my question is How do I bring this up with my gf the most sensitive way possible?