I'm 16 weeks pregnant. i have been vomiting for the last three hours and am down to yellow bile. i'm thinking stomach flu- but have no other symptms?

Seek care: Seeing pregnant patients with vomiting, especially those with hyperemesis gravidarum, are typically quite dehydrated and need help getting their salts and fluids replenished. I recommend seeing your doctor or go to an urgent care center for evaluation. Other considerations include a viral gastritis or adverse drug effect/ interaction.

Stay hydrated: as this is very important. You may have a viral illness but you also may have pregnancy related nausea/vomiting. I would discuss with with your doctor as soon as possible. Again, drink fluids, eat very small meals, and talk to your doctor about trying medication to help with your symptoms. Best of luck!

Vomiting: I feel sorry for you. It is terrible to be vomiting, especially when you are pregnant. Be sure to stay well hydrated with plenty of clear fluids (Water is best), and even Gatorade to help replace electrolytes. Call your OB doctor to alert them of your condition. as they should know for continuity of care how you are doing. If you do not feel better soon, you need to see them. Best wishes.