What are some comebacks to this rude pregnancy remark?

I’m currently 7 months pregnant with my first child. For 3 moths now people keep saying to me “did you swallow a watermelon?!” Or “are you sure you’re only having one baby, you’re huge!” I’m getting very tired and discouraged by these thoughtless rude comments. I’ve had a lot of complications with my pregnancy including kidney stones, high weight gain, high blood pressure, and now I’m on partial bed rest because im having contractions.these rude comments are really getting to me lately. Anyone have any good comebacks?