Stomach bug?

My daughter threw up at around 4am tuesday morning and again around 7pm that night. She was fine all Wednesday and then today she went back to school and seemed fine but now shes home shes complaining of a sore belly and is having loose stools(shes only been home for just over a hour and has went twice, both have been alot more loose than normal). Does this sound like a regular stomach bug? Shes still eating pretty well and acting herself, it's just every now and then she'll complain her belly is sore. Shes 3 and 1/2 and has been catching everything since she started school 🙄