Hi Doctor..I Have Been Trying To Concieve From 6 Years.Every

Hi Doctor..I have been trying to concieve from 6 years.Every month i use ovulation predictor kit and get a positive LH Surge.Does that not mean that ovary does release eggs?So I think there is some issue after ovulation may be during implantation.I read online taking progestrone might help prevent miscarriage.So can I take progestrone without testing my levels.Would it do any harm?