Play both sides: tampons and diapers.
Contraceptives are designed to prevent pregnancy. Tampons contain period blood, which happens before and after pregnancy. Diapers are for babies post pregnancy.
I don't want to come across as a proponent of an ugly situation, but I was being specific with my verbiage.
The law is currently stacked against women and makes it difficult to obtain contraception, and impossible to address the consequences of its non-acquisition or failures. Abortion isn't an option, even for rape cases. Obviously women want contraception, but it is being denied to them on purpose. The men in charge are playing the long game and shaping the circumstances to compel them to produce children.
(The conspiracy theorist in me suspects the current Adderall shortage is an intentional test run of dependency interference to see what the public is willing to put up with-- next time, it'll be a manufactured disruption in supply of chemical contraceptives.)
Your observations are correct but I was too terse-- it's not a tampons OR diapers dichotomy. Demand for both is going to increase. If there are more women, they will buy more (and better) hygiene products. If they are denied birth control, "choice" in child-bearing is reduced to a game of consistently beating the odds. When their luck runs out, they'll need diapers (and affordable childcare).
Only lesbians are safe from this nightmare. I don't know what they like to buy though.