Hello, My Name Is Belinda And I Am 45 Years

Hello, My name is Belinda and I am 45 years young. I have been pregnant 3 times in the past 3 years and all resulted in miscarriage. I tried 1 cycle of IVF and the results were very poor. I have also tried several cycles of Clomid. I cannot afford another round of IVF. My periods are regular and there is no exact reason according to the physicians why I cannot conceive. I feel it in me, I am very capable of having a child. What could be wrong? I wish I could just do something, anything, to correct the problem