Lucy, grrrr for your body not reacting the way it should. After my first mc, I had headaches for 2 months or so. I never get headaches so I googled it (of course) and read that they are common as your hormones are trying to recalibrate. It makes sense that you would be getting headaches. Not only are your hormones all over the place, you are also under a lot of stress and worry. Headaches are directly related. As for your pain, I really don't know. Have they done an ultrasound to make sure they got everything out? I'm guessing they did since you had a negative HPT. Remember though, just because your HPT was negative doesn't mean you don't still have hcg in your system. You just don't have a lot, but you might still have some. Maybe you are just sensitive to that hormone. I really don't know. All I know is how frustrating it is to feel the way you are feeling. For me, it sometimes feel like I have no control over the one thing I feel like I should have control over, my body! I think it is a good idea to call your doctor and ask about the pain.
Sugar, I'm boderline with an LP defect. I usually have an LP of 10 - 11 days. After my first mc, they went to 8-9 days for a while until I started using the progesterone cream. This cycle I used the cream just over the weekend because I didn't want my period during the wedding. I'm on 12dpo now and no AF in sight, just cramps.
I've had my progesterone checked and it is normal. I think my shortened LP is directly related to my late ovulation. I'm hoping the Femara/Letrozole will help correct that.
You might want to wait to see an FS before using the cream. That being said, I started using the cream without consulting with a doctor. My acupuncturist recommended it. She's a doctor in her own right and I trusted her. When I told my doctor I was using it, she didn't seem to care. She didn't think it was enough of a dose to really make a difference, but I definitely see a difference on the cycles I use it.
As for the sperm, I don't know about numbers. Sorry!