I had an abortion when I was 19, Imnow 24.and have been trying for a year. I even did ovulation tests & they never seem to work. Why can't I get preg?

You will need... You will need to see a specialist in the field. There are multiple reason to have problems with fertility. It could be secondary to the abortion procedure but it could definitely be related something else that can be treated. In order to find out you need to have a formal evaluation and tests. Make an appointment with a gynecologist or even better a fertility specialist in order to get evaluated.