I had really vivid dreams both times when I was pregnant - in fact that was what prompted me to test on the second time. I also had really vivid dreams when I was slightly late - to me, I feel like that was times where I was conceiving but it was wasn't forming correctly as a very early stage - first few days - then my period coming just slightly late. We tried for two years for our first child and then had the 2nd 13 months later!
Just keep trying, I would recommend that if you have no sucess after a year and you are over 35 then you should go and see your doctor. If you are under 35, they will only give you a referral after 2 years, I am sure however that this will vary in different areas.