Should I complain to my boss

I just returned to work after maternity leave is told my boss I would orefer the first week to only do 8 hour shifts instead of 12s since either haven't been away from my child more then 4 hours since birth. My boss instead scheduled me 2 12 hour shifts and gave me a day off after. I am struggling hard with postpartum at work. My boss also stated to talk to her if it got to bad but I got to work and found out she is off the rest of the week. Input please im not sure what to do or how to feel.