9 months pregnant accidentally drank 1 day spoiled milk, will it hurt baby? possible asymetrical iugr not ruled out yet. have gestational diabetes

Ingestion: of a small amount of expired milk is more likely to produce symptoms such as vomiting in you, and is unlikely to harm your baby unless you should become very dehydrated or otherwise ill (this would be uncommon in the given scenario).

Probably not: The chances are you will not fall ill from this. Not much you can do at this point. Focus on a healthy diet and exercise to help prevent damage to the baby from your gestational diabetes. This is where you need to spend your energy on the remainder of pregnancy.