And if it is so low that you have these types of issues, then you can perhaps take BC with
estrogen and bump back up to get regulated again. I had
the opposite
for a good while of TOO much production of estrogen which acted like a natural birth control pill, infrequent periods, melisma on the face (lovely), etc. That was a bummer. But definitely, out of nowhere, hormones can get out of whack. My estrogen righted itself without intervention but sometimes there is some needed.