anyone know what I can take for a very upset stomach. I have been so sick for 3 days. I am 18w

I'd ask your doctor. Someone here might suggest something that could be dangerous :)

What type of upset stomach? Like the runs, the opposite, nausea?

For the runs you can take kaopectate, constipation you can use colace, queasy tummy you can use preggie pops...ginger candy...peppermint or ginger tea......

Ps the 2 OTC medications i listed above are on a sheet given to me from my ob as safe to take during pregnancy.