Already a mother to daughter North, with her rapper husband Kanye West, Kim is said to be exhausted from her bouts of morning sickness which strike at any time of day.
The Keeping Up With The Kardashians star tweeted: "Today is National Doughnut Day! Thought I would enjoy it more but morning/all day sickness really ruins things! LOL Maybe its for the best!"
With her recent announcement Kim has also vowed to adopt a healthier diet through this pregnancy, saying: "With my first pregnancy I had a donut every morning. That's not a good idea. I feel like I'm eating much healthier this time.