I don’t agree - not to the extent you are using it - and to the extent that these authors used it - altho mathematically abortion is sometimes the result of failed contraception within marriage. But not very often. It’s kind of like using the “rape or incest” clause to make the case for pro choice - it’s hardly the driving force or the preponderance of cases. Quite the opposite.
And using the Roe V Wade court as back up for your point is hardly helping your argument.
I used (Casey v. Planned Parenthood, 1992)
NOT
Roe V Wade
I’ll let the studies referenced stand against your opinion.