Vomiting while switching from breastmilk to formula

Hi mummies, Did any of your baby experience vomiting while drinking formula milk when you first switched from fully breastmilk to a mixture of breastmilk + formula milk? Currently my baby vomits at almost every feed (sometimes more, sometimes lesser) when I’m feeding her a bottle of thawed breastmilk + formula milk mix together. Getting pretty worried! 🙁