Best and worst part of being Pregnant??

So I'm not pregnant and never have been, but would love to be within a few years. I'm so excited I can't even handle it. I think you all are amazing! Pregnancy has got to be so hard on your body. I'm just curious, what has been the BEST part of being pregnant? Physically or emotionally. And, what has been the WORST part for you? I just want to know what to expect!