Awe congrats:) yeah im 26weeks6days according to my first due date and im gonna set up their nursery next weekend after my baby shower.
I've read you should start earlier than with a singleton pregnancy because of the risk that they might come early. I'm completing mine the week after my baby shower at 30 weeks and have slowly started buying big ticket items that I didn't register for. I'm 28 weeks with twin boys too btw :)
You could start now and do a little bit each weekend. I waited until the last minute and didn't have everything that we needed.
Good luck! :)