Isabelle got done eating 5 or 10 minutes ago and she's already thrown/spit up probably half an…

Isabelle got done eating 5 or 10 minutes ago and she's already thrown/spit up probably half an ounce...😣 Idk what's wrong. she did this last bottle too. I've tried different bottles, nipples, different feeding positions, etc...I'm afraid it could be her formula maybe? but Idk what other formula to try out. we definitely can't afford the alimentum or whatever and it'll be a while until I would even be able to get into WIC. 😕