I'm 35 weeks too n yeah I have smelly farts too. My midwife said it might be hormonal as your body is changing ready for birth.
Its completely normal to have gas. When it comes to the severity of the smell look closer at your diet. Broccoli, brussel sprouts, beans, pork products and other gas causing foods will make the smell worse. You have a baby pushing all of that out on you! I hope this helps.