My son has anxiety about daycare...advice?

Looking for some mom advice. My son started daycare he’s been going for about 2 weeks now. Prior he was going to an home daycare. I’m worried he is starting to develop anxiety. The night before it’s “Mommy I don’t want to go to big school”. As soon as we pull in the parking lot the tears immediately come gushing. It’s every morning. Yet when I pick him he is happy and in a great mood and tells me he loves school. Side notes he has morning teacher than afternoon teachers. I’m just at a loss. He has been breaking my heart.