I had a abortion 7 years ago and I have been trying to get pregnant for months and nothing seemed to be working. What am I doing wrong

You have only been trying for 'months,' so this has nothing to do with an abortion 7 years ago, unless there was something very unusual about it. What has happened in 7 years, in terms of health, birth control, sexual partners, and age? A different partner could have a low sperm count. He could even if he's the same partner. There are countless variables among the two people involved, and medical tests could cost you a ton, so keep trying a while longer. The simplest fertility starter package is sperm count for him and a reading of your temp for ovulation time for you.