I totally understand wanting to double-check literally everything you eat, I was the same! Yogurt is not only safe but actually amazing for gut health and cooling your stomach. Just avoid eating it very late at night if you are prone to cold.
I eat a bowl of chilled dahi or yogurt daily with my lunch, it’s my absolute favorite! It really helps with my acidity. Are you having flavored yogurt or plain homemade dahi?
Definitely, it is highly recommended. When I was at my parents' house, my mother used to make curd-rice for me whenever I had morning sickness or indigestion. It is very soothing for the stomach, so enjoy it.
Yes, you can eat it! My saas always insisted on freshly set homemade curd instead of store-bought ones, especially during winters. She said it keeps the body cool and helps baby's bones develop well.