I Am Afraid To Try Again

I just had my second miscarriage in 7 months. Both times the doctor said it was a blighted ovum (empty sac). He said that it was just "bad Luck" because i have already had a normal pregnancy 5 years ago. I wonder if I waited too long before trying to get pregnant but I am only 33 years old and don't know why this is happening. My first pregnancy was text book it went so well. I am affraid to do this again, so I think I am going to give my body a rest and wait several months before thinking about trying again. I know I should just count my blessings with my son that I have now but never-the-less it's still difficult. Has anyone had this problem and had a normal pregnancy after?
Jude