If your delivering at a hospital. ..they will also supply of most pads (bed pads and underwear pads) and toiletries needed. But you can never be to safe ;)
I am also 36+4! Im bringing toiletries, pillow, slippers, nightgown and going home outfit and a folder for ALLL the paperwork they give
Pillow and extra blanket, phone chargers, slippers or flip flops. I also brought my own towel because hospital towels are terrible.
Don't forget pads (like the thick overnight pads) extra underwear (not the sexy ones, granny panties) and these amazing thing called Tuck (they are little round pads for hemorrhoids but will feel wonderful when you are swollen or if you rip). Sorry if that's tmi
A couple outfits for your son, one for pictures, one to take him home. I would also bring a phone charger and you might want a book or something for your hospital stay.