You literally can’t track seasons without tracking the moon. That’s why ancient cultures had agricultural based names for each moon of the year even after they adopted solar calendars.
Prehistoric cultures likely had names for moons too but based around the migration patterns of the herds they hunted and the wild plants they gathered. Because you literally cannot track when the herds would be in their summer grazing areas without tracking moons.
No prehistoric woman is going to need to know 28 day cycles. The 28 day cycle for menstruation was literally invented by a Victorian doctor who decided that this was the average cycle length for women, and the average gestation was also 40 weeks. He did this with no scientific study whatsoever. Then when the BC pill was invented, the manufacturers simply used this 28 day “standard” pulled out of some man’s arse number to artificially induce a 28 day cycle on women. Today, we think this is natural…it’s not. It’s a construct. An artificial overlay.
We know that actual natural menstrual cycles vary from 25-32 days. They are not 28days. We know too the prehistoric women likely had very irregular periods due to malnutrition and STIs, so the idea of prehistoric women even having a regular period of any number of days is preposterous.
The moon, however, was a regular, infallible 28 day cycle in prehistory (extending to 29 days by Ancient times) and tracking it was necessary to know when you need to migrate to location x to hunt the migratory herds, to know when to be in location y to harvest the wild rye or yams or whatever, to know when to scatter the wild seeds for next year, to know when the fish would start coming up the rivers in spring. You can’t know this without tracking the moons.
Stonehenge is a lunar and solar calendar, it’s not tracking periods. The handheld scored bone and stone lunar calendars were for easy transport to take with you. The prehistoric equivalent of having a watch instead of going to London to look at Big Ben.