Serious question

Jessica
Today I go in for my 36 week appointment. I work as an STNA, 12 hour shifts. I don't want to go on maternity leave yet, but if I ask my doctor to write my work a note stating to cut back my hours to 8 hours, do you think she would? 
12 hours are becoming so hard on my body, with the work I do and being on my feet constantly.