I have been drinking redraspberry leaf tea, I don't think this helps improve your uterine lining but it help tone your uterus which is also important after a miscarriage. Look it up on Google because there are varying reports on if you should drink it through your whole cycle or only part way through.
Re: How can your improve your uterine lining?
Do you have a LPD?
Vitex - 1,000 mg daily, it's supposed to be better than B6. Combine Vitex with Red Raspberry for LPD.
Red Raspberry - 1,000 mg daily. Strengthens the uterine lining. Combine RR with Vitex or B6 for LPD.
Baby aspirin, although you should clear that with your doctor first because it can make certain medical conditions worse.
While you are talking to the doc you can also ask about estrogen supplementation. A lot of women on clomid take it because clomid thins the lining.
HTH!