FIRST UNCOMFORTABLE BELLY RUB 😠

Daniela
So I usually work at night, and get to the office long after most of the day shift workers are gone... well today, I got here a little early and this coworker of mine from the day shift asked if he could touch my belly! It took me by surprise and we were with a group of others so I felt odd to respond negatively that I just said "Suuuure" ever so slowly but quite obviously uncomfortable. 
I guess what really weirded me out is it's a male I'm not even very close to! 
I'm showing a little bit but I'm only 5 months so it's not like I'm exploding, which has me feeling like "what are you even touching, dude?!"
Anyway had to vent here because if I tell my husband he will flip his lid! 
I really regret letting this man touch my belly!😡
How do you all handle unwelcome hands?!!