Sympathy morning sickness?

Wondering if you have experienced this or have any insight. I’ve had awful morning sickness for most of my first trimester. My pup, who is usually very independent, has become very attached and cries at the bathroom door when I’m sick. Two weeks ago he started violently vomiting for days. The vet couldn’t explain it as my pup hadn’t gotten into any new foods or met any new dogs. They did a full work up and nothing unusual came back. I joked it might be sympathy sickness but my vet and husband thought I was crazy.

This morning his vomiting came back after I’ve had a particularly rough few days. Am I crazy to think this or what could the vet be missing? Anyone experienced something like this?