FOMO and hypergamy
Sexual (and financial) hypergamy for women has a significant psychological consequence in addition to anxiety: Fear Of Missing Out.
Every hypergamous woman who pursues a man out of her league as her instincts demand is constantly wrapped by the fear that her current target(s) is not the most sexually (or financially) attractive man whom she has a chance with. What if a better man turned up shortly? This was one of the reason why many women would not engage in promiscuity when young and were virgins on marriage: being already pregnant with a less attractive man would prevent them from becoming pregnant with a more attractive man, so it was a difficult step to take.
Note: The other reason why most women were virgins on marriages was that the mothers of the grooms insisted on it, to ensure that their investment in bearing and raising their sons would not be voided by the bride being already pregnant with the child of another woman's son.
The Fear Of Missing Out was particularly strong before anti-conceptionals: getting pregnant with a man out of her league meant being unable to get pregnant with a man even more out of her league, for at least the duration of the pregnancy. Thus the high demand for abortions in the past, and also in the present.
Note: in some (mammalian too) specieses females kill their cubs if their main male mate dies, in order to better attract a new male mate.
The anti-conceptional pill changed a bit that situation: it simulates pregnancy to prevent conception, but a pregnancy that does not last 40 weeks, and stopping taking the pill simulates ending the pregnancy, rather quickly. This has enabled many women with a weaker instinct for reproduction to sample many men, even those slightly less attractive than their ideal of a father for their sons, knowing that there was no risk that these less than ideal fathers would make them pregnant. However old instincts persist and for many women FOMO is still a powerful force leading them to procrastinate pregnancy.
There is however another side to FOMO: that the more they wait, the more hypergamous women age, and therefore their league falls, and so also the attractiveness of the men most out of their league they can target.
So many women are caught between both sides of FOMO: wait too little, and they may have to give up on getting the man most of their league they can realistically get, and wait too much and their league decays to the same effect.