I saw your age,you are so young.Relax and get the right mood when making love..dont keep putting that pregnancy thought in your mind..That may pressurize you??
From what I read in thread:
-Get a checkup from Gynae,together with your hubby,relate your situation to the doc and see what advices you can get.
-Go for chinese traditional medicine and cure
-Go for western medical
But different remedies work on different people.