Don't stress 4 cycles is not a long time, although it probably feels like it. In my first lot of ttc it took me 3 years to get pg, in my second it took 9 months (with a different partner) and both ended in early m/c. The first time round I thought it would happen fairly quickly as I was 28 at the time and it came as a huge shock to find that it didn't. This time round I was pleased that it only took 9 months as at 40 my chances are much slimmer than what they were at 28, but it actually happened quicker. You just never know when it might happen so just enjoy the bd'ing along the way. Good luck.