Feeling a little discouraged....

Kaity
After my second born, when I stopped nursing, I got my period a month later, and then pregnant the following month. (Literally..... stopped nursing on the 4th of October, period the 4th of November, made baby 3 on the 4th of December.) 
I haven't nursed for 6 weeks now and still no sign of flow. Nothing. Pregnancy tests all come back negative, so I know I'm not pregnant yet, but what the heck is going on with my body?!? 
Anyone? Any ideas on how I can get shark week started?