Serious depression from ttc. PLEASE comment

I want to be pregnant so bad and I really think it is effecting my well being. My husband and I decide to have an abortion 4 years ago (we weren't married then). We weren't ready and we were young. Now we have been trying and nothing is happening. I have regretted the abortion even before we started ttc again. I'm not sure how to deal with it. We are so ready to have a baby and I just want that feeling of a bfp. I replay the day I got a positive test for years ago and I just want that again. Advice PLEASE