Is this enough to be worried(reposted in right section)?

so in the last 6 weeks probably my dogs thrown up 4 times. only 2 were close together and the others spaced out one being today while i was at school. is this enough to signal a problem? shes acting normal and eating normal. im going to call the vet in the morning but just wondering if its an overreaction on my part. also my dog rarely gets table scraps and i know for sure she didnt get any before she got sick this last time. shes an 8 yr old basset coon hound mix if that matters