Trying To Conceive. Taking Duphaston. Have Thick Endometrium. Is This The Reason For Infertility?

Hi, I am 28 year old female married to 31 year old man 4 years ago. we are trying for conception since one year. But could not get successful. after first few trails, my doctor advised me to take Duphaston and Progyanova during and after ovulation . because my endometrium thickness was low as 8.1 mm in every cycle. I followed the medication. i again did ovulation study quite a times. i ovulate on 14th day of my cycle. But i did not get pregnant. Then these above said tablets were stoped. is my endometrium thickness problematic?? in September 2012, i was advised to undergo Sonosalpingography. both tubal patency is good. no blockages. uterine cavity is normal. then i was advised to take Tab. Productive-F. i am taking this tablet from 4 months. recently we did semen analysis for my husband. it showed 10 milln / ml for 2ml sample. we were thinking of going for IUI treatment. But our doctor said not to do it now. She advised my husband to do Scrotal doppler sonography and few blood tests like FSH, Prolactin and Testesterone. below are the results - scrotal doppler sonography - no blood veins affecting testicles. everything normal. FSH - 19.8 Prolactin - 8 testesterone - 136 again we did another semen analysis with gap of 7 days from above said test. it came out to be 20 milln / ml for 2ml sample. based on above results, doctor has advised him(my husband) to take Tab. Ecozyme(1 per day) and Tab. Fertile-m(1 per day). are above treatments for both of us going in right direction??