Ferning- anyone tracking this?

I read about ferning yesterday and decided to check it out since AF was due any day. Got what I would note as transitional ferning and lo and behold AF started two hours later. This is supposed to correlate with estrogen levels, so as we approach ovulation it would come back then drop out again until right before AF. I checked today and there is no ferning so it seems accurate so far. Anyone tracking this? It’s really fascinating! I’m hoping to use it as a way to keep BD’ing to the optimal window and not play the guessing game waiting for peak LH.