AITA for not shoveling snow right after giving birth?

I (21F) gave birth three days ago to a beautiful baby girl.

We got home from the hospital earlier today. My husband (29M) is beyond excited. He arranged for his parents to come over for dinner and to meet the baby. He asked me to make a duck roast, potato salad, beef, tartare, squash soup, steak and two different pies, (pumpkin and pecan).

I am really exhausted. And I’m struggling to care for the newborn and our toddler (2M) at the same time. I exclusively breast-feed per my husband’s suggestion. But I agreed to make the dinner because I am a really good cook.

I needed to run to the grocery store to get some ingredients. But my car and our driveway were covered by inches of snow. My body is really hurting so I asked my husband if he could shovel the snow for me, and I can then drive to the grocery store with the newborn and our toddler. (In our household, the children are solely my responsibility because I gave birth to them.)

My husband refused to shovel snow because I am the one on maternity leave (I am a physics professor at Harvard and they have a pretty generous maternity leave policy) so I should be the one taking care of all of the household chores. I know that my husband is ultimately right as he has to go back to working at McDonald’s the next day. He is a cashier, so he hast to be constantly on his feet.

However, I really didn’t have the strength to shovel snow in the moment. Our driveway is huge. I bought the house using the money I got from winning a Nobel prize last year. We don’t hire any help around the house because my husband believes it is my responsibility as a woman to run things smoothly without wasting money on things that I can do myself.

I asked my husband if he could shovel the snow for me, but he refused and mentioned that my waist had grown over an inch from my pre-pregnancy body. I used to have a 9 inch waist but now it’s grown to 10 inches. My husband said I could really use shoveling snow as a form of exercise to lose some weight.

Because I was exhausted and hurting badly. I told him that I won’t go to the grocery store unless he shovel the snow for me. He became really upset and began calling me a lazy a hole. He claimed that I disrespected him and his parents by not being enthusiastic about hosting.

I feel very conflicted, do I have the right to say no in this case or am I just lazy?