Stomach hard? Bloat?

I'm already overweight so the thought of a bump at 9w4d is comical to me but any other overweight/obese moms finding under their typical belly fat it's starting to get a little firm?  Is this the start of a bump?  Or am I maybe building ab muscles from all this throwing up 😂 Maybe it's bloat but it seems very centralized to my lower abdomen about 5-6 inches below my belly button.