Though it's sometimes known as the "pregnancy hormone," progesterone is something that you have to deal with at other times of your life as well, not just when you might be trying to conceive. It's super important during pregnancy, that's true, but it's also a big part of your menstrual cycle. Knowing some of the signs your progesterone levels are too low can explain some of what you might be experiencing. And this is true for all different hormones in your body. Having an idea of whether or not they might be too high or too low can help you get to the bottom of what's going on in your body and give you an idea of what might need to be done or what questions or topics you might want to raise with your doctor.
Each month (and at different points in your life), your levels of reproductive hormones like estrogen and progesterone can fluctuate, depending on the time of the month and what's going on in your body. Your hormone levels can also, like with cortisol, be influenced by other things that might be going on in your life and your environment. This can, in turn, have a big impact on your overall health and well being.
Some of the signs that your progesterone levels might be too low can be symptoms or experiences that can have a number of different causes, but recognizing that they might be something that you should bring up with your doctor, particularly if you're pregnant or trying to get pregnant, might help put these issues on their radar if they're things about which they maybe wouldn't otherwise ask.