Abnormal Discharge

Hi, I just wanted to see if anyone else has had this. I will be going to the doctor soon, but just wanted to see if anyone had any idea what's going on. So I was having this thin white discharge sometimes pink with an odor kind of like ammonia, vinegar, or possibly rubber. It is very difficult to describe, because it's hard to place the smell. It is also not a strong smell you can only really smell it if you smell the discharge. Anyway I was having it for a month or so and I thought it was a yeast infection so I took monistat and it went away for a few weeks, but recently it came back. I am not pregnant. I have been sexually active. I have no other symptoms just this discharge. Should I be concerned? Has anyone else had this? Let me know what you think and feel free to ask me anything thanks.