Sick SKs

We have my SKs 50/50 week on week off and switch on Monday afternoon after school. This past week they were with BM and she took them to an amusement park. SD just FaceTimed my husband and told him they’re not at school because they all have the stomach bug and are throwing up. They’re supposed to come back to our house this afternoon but we have a 20 month old and I am 31 weeks pregnant. I told my husband they are absolutely not coming back here to get us all sick when they’re throwing up and then need to stay with BM until they’re are better. Am I being unreasonable?

Edit to add: my husband is on my side here since I am so pregnant and he works full time while I stay home so I would be the one taking care of all three of them throwing up. He also agrees it doesn’t make sense to transport them 30 min in the car while they are actively throwing up. That just sounds terrible for everyone involved. It is BM who wants to send them back because she doesn’t feel like taking care of them while she is also sick.