Paranoia and Discouraging Thoughts

I was ok with this whole ttc thing. I knew it wouldn't really happen the first month we tried (like it has for the last 3 times). I knew that we couldn't really expect that again. Now here I sit, 5 months later trying to figure out what the hell is going on. I always had an insanely predictable cycle. 28 days (NEVER longer) with O pains, etc. on day 14. Now lets be honest here. With IM living here, it wasn't like we had a chance to put everything we had into ttc. Not only that, but this has not been the best few months between dh and I. There was a month (September maybe?) where we decided to put ttc on hold. And then there is his work schedule. But damn it, this month I thought for sure we had it. Now FF doesn't think I O'd when I thought I was going to, and now our chances look pretty much shot to hell. And that is IF I even O'd at all. This cycle AND last I got the dotted coverline. So now my mind is going a million miles an hour trying to figure out what the problem is. Could it be the year of birth control pills (I had never been on any form of BCP until after Evan was born). Or maybe the year of breastfeeding?? I KNOW 5 months isn't long at all. I KNOW this, but I still can't help but wonder what the hell is going on.