Pregnancy after tubal reversal

So in April 2015 I underwent a Tubal ligation reversal. In the month of July 2015 I found I was pregnant. At this point it was 5 weeks after my missed period. I then miscarried. We have been trying since October and have not gotten pregnant. Was this a fluke? I'm trying to be hopeful but have not had any success since. I'm wondering that if I got pregnant once chances are that I will be able to again..?? Hoping!! :/