Low Progesterone

Annabelle
I just had my cycle day 5 and 21 blood test results back.. Turns out my progesterone level at CD21 is 7nmol/L (it should be more than 30). Has anyone here been diagnosed with low progesterone? What treatment did you receive? 
​It could be that I haven't been ovulating all this time - I'm on my 10th month TTC. The thought of that makes me sick - all that wasted time and hope. Or I'm assuming even if I have been ovulating the low progesterone is not maintaining my uterine lining so implantation wouldn't be able to occur. Either way I'm upset and worried - deep down I was always terrified there was something wrong with me, hope it's not a self-fulfilling prophecy?