Torn and needing some advice

I have been married for almost 3 years now and for the better part of those three years I have practically been on my knees begging DH to start TTC. He had been reluctant due to him already having 3 kids from previous relationships, being in the active army, etc. But now that he has moved to the national guard and we have settled down with no chance of deployment for at least two years he is ready to try. We tried last month but got a BFN and AF showed up exactly on time (almost to the hour).

But now I am in this weird place where I am almost second guessing whether I want to TTC. I mean I really really want to be a mom and moreso with my husband but something in my gut keeps saying something is going to go wrong. We had a m/c two years ago and maybe I am just scared of failing again. I don't think I could stand knowing that my husband was able to have three other children but that there was something wrong and we couldn't have one. At least we know that we can conceive... we just need a sticky one.

Has anyone else been confused once they finally started TTC? I have no idea where these feelings are coming from since this is all I have wanted for years. Help I am losing my mind.