Yes, though I would say abstinence to avoid children is at least in line with nature, whereas artificial contraception goes against nature.
I am not sure I agree with this completely.
I'd reckon that it was more in line with nature to have 5 children and contracept so they were spread 2-3 years apart, than to have 2 and stop having sex from the age of 30 in order to not have more (assuming the reasons are facile). The second one seems to me to LESS of an openness to life than the first. It is certainly pretty unnatural not to want sex with your spouse.
As an example, I know a number of rich families in New York and Moscow who plan when they are going have children, the women comes off the pill at some convenient point to their lifestyle and then goes back on. I've joked that I just leave it to God/fate to decide and they think I am crazy, like not turning air-conditioning on in my car in a hot day. They plan everything, when and where their kids are going to school, pensions, who flies coach or business class and what they are eating at the weekend.
But they still have 5 children, because they like children and they see a large family as a good healthy thing that makes their marriage meaningful. They don't want 2 because they have more of everything and they have tons of energy.
There is the very good argument that it depends HOW you contracept. Some contraception is abortifacient. That is clearly
not more in line with nature.
The ancients must have contracepted as soon as they understood the natural cycles of a woman (which the Greeks and Romans understood), but they all had reasonably large families.
I guess I am having a hard time picturing Trad men who really want to get married and scrape and save for it, having sex one or two dozen times in their marriage (which is all it would take to have two kids) and then living on the memories of that for the last 50 years of their life.
What a miserable existence.
Why not go on Spring Break, go to confession afterwards, and remain single, or adopt an orphan? Frankly, you'd probably have better memories.