No dining in while unvaccinated

I'm in my week 19 and unvaccinated as I chose not to till after giving birth. My MIL keeps wanting me to use a screenshot of her fully vaccinated Tracetogther status to enter restaurants to eat with the family. I'm worried about the legality implications should I get caught (preggies look more suss in this situation) and also worried about getting covid as well. What should I do...