Insight into significant temperature drop after ovulation ...

My husband and I have been TTC for a few months. I've been going and getting acupuncture and I've been getting all good signs up to after ovulation. My tempature will rise two days after and then drops significantly. From what I've read this is the "luteal phase" and my body isn't producing enough progesterone. Has anyone else experienced this? Does anyone have any insight as to why my body is doing this? Is it something different then progesterone levels? What did you do to help your situation? I'm trying hard not to get discouraged but it's difficult -- thanks in advance for any insight that might help!