Clomid and thinning of uterine lining thinning

I had two cycles at 100 mgs and got pregnant both times. One time resulted in baby last time a miscarriages. Since I had a miscarriage she pushed up the dosage to 150 mgs. I 100 percent ovulated but no pregnancy came from it. I read high dose of clomid can causing uterine thinning. I wasn’t sure if there was a preventive measure I could take. I’m giving my body a break.