Losing pregnancy again and again, what is wrong?

My wife was pregnant this year in March, it was our 1st pregnancy. In the 1st USG on 7th week report was not good, doctor said that its a blighted ovum so let’s try after one week, if not positive then we will go for DC. Unfortunately we had to go for DC after a week. Now she conceived again after a gap of 8 week. In the meanwhile my wife had gone under some tests as suggested by the doctor and also took some medicines. She was also suggested folic acid and one more tablet. In our 2nd pregnancy, yesterday we went for USG. This time the growth is showing but again heart beat is not found. It is 8 weeks 2 days now.

Please suggest what to do and why are we losing pregnancy again and again? Is there any deficiency among us or is it just a bad luck. Our doctor has asked to go for USG after a week but hope is less.

 

Losing pregnancy again and again, what is wrong?
Obstetrics & Gynae