Discharge shouldn't have any smell but I think I get what you're trying to say. I normally get the funny onion smell down there when I sweat a lot but not frequently. I Googled it and it's true. Also it will smell like onion if you eat a lot of onions or garlics which I don't. Also important to change your panty liner frequently and your panties and use cotton panties. Just don't wear any liner to sleep. Let your V breathe eventhough the liner says it's breathable
It is better to inform your doctor because of your pregnancy