Could I be pregnant after my mc?

I had a natural miscarriage on November 24, 2011 that completed on November 25, 2011.  I am not sure how far along I was, because I thought I should be going on eight weeks but they said the sac measured at six weeks five days, and they had just finally discovered a fetal pole on November 21, 2011.  I had an u/s on November 28 and they said that everything had finished coming out.  I bled until about December 1st, then started bleeding again around December 8 finishing about December 13 (normal length of bleeding if that was my period).  I got my period again on January 5, 2012 which seemed a normal cycle for me (I'm normally anywhere from 28 to 30 days).  

Now it is cycle day 37 and I still have no bleeding, not even a little.  I have taken five hpt's but all came out negative.  Can I still be pregnant even though the tests are saying no?  Or is this normal?  If it is normal when should I expect af to make her appearance?  

I intend on making an appt with my gyno on monday as they are closed for the weekend and I couldn't get hold of them yesterday.  Has anyone else experienced something similar?  I would absolutely love to be pregnant again and was planning on trying for a 12/12/12 baby, but if I am pregnant now I will look forward to a 10/11/12 baby, however I do not want to get too ahead of myself.  

I am trying not to think about it too much but I can't help it, when I have a moment that is where my mind goes.  Please someone respond!

[Dr. Kokil Mathur]

Hi!
Post miscarriage and medical termination of pregnancy, yes it is possible that the menstrual cycle can delay or behave erratic. To confirm, take blood test for HCG estimation as this is more reliable. If this test is negative, chances of pregnancy are less.
Also hormonal causes, polycystic ovary, hypothyroidism as a cause will have to be ruled out. Do discuss this with your doctor and get yourself examined. Take care!