NTA

Pregnancy is not an excuse for taking four pies and having a crying fit because you got one piece out of those four pies. Hormones are not an excuse for this either. There is never an excuse to be rude to another person's when they are being reasonable. She owes the op an apology.

I've been through four pregnancies (two that ended with live birth, two miscarriages from outside issues) and I am gobsmacked that she has done this to him. She needs to go see her doctor, and no not just for gestational diabetes, but for a full blood panel. Anemia can cause issues like this (I craved salt, not salty foods, straight salt because of anemia), pica is a concern, hyperglycemia and hypoglycemia are concerns, asking with a while host of other possible issues. And what she is doing is plain not healthy, for her or the baby, and something she apparently needs to hear from her doctor, since she is treating her spouse badly for expecting her to actually not eat the last slice from four pies!

Being pregnant is not a free pass to treat others poorly. And especially not a pass to possibly endanger the baby she is growing with that level of poor nutrition.