Really bad smell?

Lily-Anne
For the past three days I've been having the most horrible smell coming from my vagina, there's no pain and my discharge hasn't changed texture or amount, so I'm confused as to what it could be. 
I'm a very clean person, so I hate being smelly and feeling unclean, but nothing seems to be shaking it. 
I've been to the doctors before about it and nothing is wrong, but I do have PCOS so I do tend to have more dishcharge than normal.
I'm also two weeks late, so could this be contributing to the smell? 
Any advice? 
EDIT: the smell kind of resembles yoghurt or glue, its not a nice smell at all!