Ttc 7 months post Marina removal. Still have not conceived.

I had my marina for about 4 years. Had it removed about 7 months ago. I have been having regular periods. Tracking my ovulation and doing the tests. Checking my cm daily. I am trying for my second child. I have done everything thing that the Dr told me. I stopped caffeinated drinks, taking prenatal vitamins. What am I doing wrong? I'm getting vary stressed. Does anyone have any ideas to help me conceive quicker?