6+3 weeks. Stop working or not?

jane
I'm working as a nanny 11 hours a day. I had last week off when morning sickness hit me like a truck. I'm planning to tell my boss tomorrow when I go back that I don't think I can work 11 hours. Maybe half day (she has people for backup care). What do you think? I'm so tired and sick everyday that I haven't leave my house in 5 days.