What Causes Delay In Periods Soon After A Miscarriage?

Hi. I am just a frustrated woman, who feels I cannot get any real answers. I had a natural miscarriage on October 25th (I was 7 1/2 weeks). I know that is early, and I know millions of women have miscarriages every day, but I was still not prepared for that emotional and physical roller coaster. I had some light bleeding about a week later, and was told that was probably just leftover tissue. After that, I had a regular period about 27-28 days later, which was just a little heavier than normal. I was told to wait 2 cycles before trying again, so my husband and I have been careful and using other protection while waiting for my second period. It has been 38 days and still not even a hint that I will be starting any time soon. I have not had the greatest experiences with doctors and I am just about ready to scream just given the run around over and over again from EVERYONE. Could you please shed some light on this for me? I feel silly asking an online doctor, but at this point I am desperate. I have been patient and held myself together during this time, but feel like I am being reminded every morning I do not start my period that I am just one day farther along without any steps in the right direction.