Is the following statement sinful?

Q: My wife is pregnant Alhmadulillah. It's still the beginning of her pregnancy, but I try to buy the baby's things bit by bit to get good offers instead of buying everything last minute. My father told me not to buy so much yet and I answered something like "But at last minute one doesn't have all the money at one time". I know Rizq is from Allah and he could give me as much as he wants any time. What I meant is that I am planning on the grounds of what I have now (monthly). Is that statement and this approach sinful or even kufr? I regret saying it like that.

Performing Qadha Salaah instead of Sunnats

Q: I have many years of qadha salaahs. I need to know if I can read my qadha salaah instead of the sunnah salaah. I know that when I am a musaafir, I am exempted from reading sunnah. What about when I am a muqeem? When fardh salaah is more important then sunnah, then please advise if I can read all my fardh qadha salaah in place of my sunnah of zuhr, maghrib and esha.