too much exercise ( maybe even stress ? ) can cause fully adult women to temporarily stop having periods. the conditions have to be right for pregnancy. if you're destined to lose the child it is better not to get pregnant in the first place as far as evolution is concerned - better to save resources until the time is right.
Discussion
nostr:npub1nshq4pcyzdmnewg4h8yu6tsuh5t72whzkz5x4wj7t0c0cy7yyrfqq2cgnl nostr:npub1qfkcklnmes45z75y7y8dkud5yll8vp5eq5ysk9rmgqdxeasv8unsrfj6kq nostr:npub1ecdlntvjzexlyfale2egzvvncc8tgqsaxkl5hw7xlgjv2cxs705s9qs735 nostr:npub179le7mlcuwj7l9dm6gy4seutqgvd7fwj2w35shm4dkr4te3q36ksd3lf56
That's victim mentality. Resources should be so plentiful that a woman can lose 20 babies before having one survive to birth.