Craving then getting sick?

So im 34 weeks pregnant and i crave a lot of sweets. Like last night it was chocolate chip ice cream with crushed up chocolate chip cookies marshmallows with chocolate syrup then after i ate it i threw it back up.. And sunday night it was strawberries rolled in sugar dipped in vanilla ice cream with a bite of Hershey's after i ate that i threw it back up. Why do i keep throwing up after i eat what im craving?