Where is my period!?!?

Jos 🍀🌸 • Mama of 2 boys and just had my baby girl November 17/16. Third and final.
My baby's heart stopped at 11 weeks along and found out at 13 weeks. I had a d and c Dec 4/14. I want nothing more then to be pregnant again!  I took a pregnancy test yesterday to see if it would pick up any hcg in my system and it didn't. It came back negative. Then were the heck is my period??  It is officially a week late. I just want it so I can get back to ttc. Who else has gone through this and how long before you got yours back??  I can feel some cramping but nothing..... Ugh