Uy, first baby jitters, yan talaga!
On the due date thing, going past 40 weeks happens, lalo na pag first baby, pero definitely check with your OB about that since dates can shift, especially kung may anterior placenta ka (which is normal, don't worry!). The breech position at 6 months is totally fine pa, maraming babies pa yan mag-turn by delivery, so walang pressure diyan yet.
For EBF, honestly ang best approach is eat like normal lang pero nutrient-dense, kahit simpleng ulam with protein (chicken, fish, eggs), green veggies, rice. Hydration talaga is KEY kaya drink lots ng water, coconut water, or soups throughout the day, maraming moms sa circle ko swear na tumaas supply nila pag nag-water lang consistently. Lactation cookies help din some people, pero pag nag-start ka na, OB or lactation consultant ang best mag-guide sa inyo since it's so individual.
For baby stuff, honestly? Start small, newborns need diapers, onesies, a safe sleep space (co-sleep or crib, pareho okay long as safe), and a stroller or carrier kung gusto mo nang gumala (totoy is fine sa arms for short outings pero stroller helps pag mahabang bili). Bilhin lang step by step, hindi lahat agad, kasi marami din regalo from family usually.
Pero sis, ang daming nag-overthink on first pregnancy, totally normal ka. Maybe reach out din sa isang mum friend o OB when you can, para hindi ka mag-isolate with just hubby? That feeling of overwhelm is real, and you deserve support!