1st time daddy advice needed...

My hubby and I are first time mommy and daddy. I'm pregnant but ever since finding out, my hubby has been over protective of what I do. He literally gets mad if I even lean on the shopping cart. I tell him it's fine, the baby is super tiny right now. I tell him to do research himself so he can know things but he doesn't so how can I get him to just relax a little bit? He makes me frustrated.