Opinion on using an Elliptical Trainer during the first trimester?

Hi there :) I'm currently TTC and I have an elliptical trainer at my house which I've been using to help weight loss. I know it's good to keep your fitness up during pregnancy and I was wondering what people's thoughts are on using an elliptical trainer during the first trimester? Have you used one during pregnancy? If so how long do you use yours for? Thanks! :)