Preparing for babies 💭

Mrs. A
My EDD is 24 November but at my 10 week appointment the doctor said she would take them between 35-37 weeks which would put me in mid October early November, which makes a huge difference on getting I went in for my 14 week appointment and this doctor said she would prefer they stay in until 39 weeks no further then that. I'm really confused on when I should prepare myself for my little ones to come this is my first time being pregnant and I want to be as organized as possible but with conflicting due dates I don't know when I should start doing anything. I'd like to take prenatal classes, have a baby shower, and get their nursey set up before they come but at this rate I have no clue when to expect them. Any advice on what to do would be helpful. I'm having di/di twins if that changes anything.