You have heard and will continue to hear that you need to relax. I will expound. Stress can affect your cycle, delaying your period and/or inhibiting ovulation. Even in the best of circumstances, the statistics are that only 20% of fertilized eggs result in successful implantation and pregnancy.
My husband and I were "trying" for a year. I charted my ovulation (you can get ovulation test strips inexpensive from earlypregnancytests.com.) My husband is in the miltary which made the timing even more difficult for us as he kept getting sent off for training and I was getting more and more frustrated.
As December approached, I looked for a refill for my calendar (in which I was doing all of my charting.) I didn't find one immediately, so I decided to take a break from the charting and just see what happened. We had a wonderful trip to Disney World and the normal stress of the holidays. In January, we had a weekend just my husband and I ... in February, I found out I was pregnant.
One more note: If you are looking for a job (and need a job) finding out you are pregnant will just shift the focus of stress. Yes, you will be happy to be pregnant, but then comes the stress of how you're going to affort the baby if you don't have stable employment by the time you start showing. I'm not saying stop trying, just perhaps prioritize a little differently. Get your health sorted. (And yes, not sleeping is not healthy. You need to get that sorted soon because pregnancy will add to you fatigue but also contribute to insomnia.) Keep looking for work but develop a financial plan in case you don't find permanent employment before you get pregnant.
I wish you luck in all your endeavors.