Somehow you have got to stop stressing yourself out. With our first, we tried off and on for a year and I stressed every month about it. My husband kept saying he fully believed my stressing was why we weren't getting pregnant.
One month he got injured at work and ended up in a full leg brace. I was beyond frustrated that it was going to be one more month that we didn't get pregnant. Wouldn't you know that month I had NO expectations was the month we got pregnant? (Yep, I got an "I told you so" from the hubby. LOL)
As for early testing, my cycle is often off as well. I am pregnant with our 4th right now and it took a few days after my cycle was due for me to get even a faint line. It took another week after that before the line was darker and easier to see. My doctor did an early sonogram and come to find out, my "off" cycle was a week off so that's why it took longer for me to get a positive test. According to the pregnancy test's 800#, it takes 11 days from CONCEPTION for you to get a positive test result. It is only the 12th of June. You could very well only be 8 or 9 days into conception.
Good luck and do all you can to RELAX. :)