Yaar actually small amounts in Chinese food is totally fine. Just don't go drinking it directly or using too much of it. Homemade cooked dishes are safe.
I craved sour and tangy things so much when I had severe morning sickness. A splash of rice vinegar in my soups really helped change my mouth taste and made eating easier.
The normal commercial rice vinegar we get in local grocery shops is perfectly safe for cooking. I used it in my homemade veg Hakka noodles occasionally, no issues at all.
In food it is fine, but vinegar can sometimes trigger bad acidity or heartburn during pregnancy. If you face severe reflux, better to avoid it and ask your gynac for safe solutions.
Yes, standard pasteurized rice vinegar is safe. Just avoid any raw, unpasteurized artisan vinegars from local markets because of bacterial risk. Commercial brands are absolutely fine.
With my PCOS history, I was very careful with processed foods and condiments to avoid gut irritation. I only had rice vinegar in cooked dishes in tiny amounts. Better to keep it minimal.