Toning up while pregnant?

Aubree • 28. Married. SAHM. Twins,🧑🏼👼🏼. Baby #3🌈 🎀 due 3/26/19.

Curious, but is toning up while pregnant a reasonable goal? I’ve been doing yoga 4-5 times a week and some cardio. Hoping to lose fat and gain muscle. Is there a safe way to do this?