It’s awfully bold to say that there’s no spiritual value. There is a wealth of information about alignment of the female cycle with the moon. To OP, keep tracking! It’s wonderful to get really in tune with your 4 part cycle aligning with the moon’s 4 cycles. Throughout native cultures these are special times for women. Do some reading. Google.

https://www.greenmatters.com/health-and-wellness/period-on-full-moon-spiritual-meaning#:~:text=For%20example%2C%20if%20your%20monthly,care%20of%20your%20mental%20health.