It is unlikely that the prior abortion has anything to do with this.
How long have you been trying? We don't consider fertility issues until at least a YEAR has passed without success.
If it's been that long you and your partner should see a fertility specialist. You can expect a complete physical and internal exam, including blood work. Your partner can also expect a sperm count. It can be him, it does not have to be you.
Also, if you have been using Depo, it can takea very long time for you to become pregnant after use.
Hope it helps.