Tmi, but smelly cm? Normal?

I've had fishy smelly discharge my entire life. My doctor at one point said it was normal for me. The cm itself is not abnormal looking, nor do I have any other symptoms such as itching or burning with urination. The smell only happens a couple days a month and goes away. Generally seems to be around/after ovulation. I have to wait 4 months to see an ob/gyn, but I've heard it's relatively normal when it's not consistent. I'm just a bit concerned that it could potentionally affect my fertility due to a change in ph. Anyone have any insight? Thanks.