I'm having this issue at the moment. I think I've had several chemical pregnancies, but only one has been confirmed by BT. My Acupuncturist suggested that it might be a problem with implantation and blood circulation, and that low doses of aspirin might help. I googled it (chemical pregnancies and early miscarriage) and aspirin, Vitamins C and B6 might help, so I'm taking all three.

I know self-medicating is probably a bit naughty, but they are all safe as far as I can tell, at least in moderation. I found quite a number of articles on the web about low doses of aspirin being good at preventing early miscarriage - I'm hoping it does the trick for me. I bought a packet of 300mg aspirin tablets and I've been dividing them into quarters, and taking one a day - that makes them 75mg, and apparently around 81mg is what is recommended.

If you google aspirin and chemical pregnancies or miscarriage, you should be able to find a number of articles.

Also, I'm definitely not an expert, and I would always suggest talking to your FS or GP if you're wanting to 'self-medicate.' Otherwise, it's obviously at your own risk. Just my little disclaimer there

and let me know how you go.