TTC / Irregular periods

Katie
For most of my life my cycle has been regular - 6 days of bleeding, about 29-32 day cycle. In April everything was delayed and I thought I was pregnant. (Husband and I use condoms only). I took a few tests over a few days and neg, neg, and neg results. I was crushed because at that point I wanted to be pregnant to badly! That cycle was about 40 days until my next one started.
After that we decided to start trying, but have run into issues. After that 40 day cycle, we TTC and when I was anticipating the 2 week wait before testing, my period started. Same thing happened again 2-3 weeks later (yesterday period began again). I've read about implementation bleeding and this is not that. 
I'm so frustrated because I have no idea what set my cycle off a few months ago and why it's still off and recovering. 
Any thoughts/tips/help from someone more experienced in this? Obviously I'm new to this but that doesn't decrease the desire to conceive.