Implantation cramping?

Hey everyone, I have been TTC for a long time now. Trying without really trying since December 2008, seriously trying since March 2010, took a 6 month break in winter, and have been trying with the help of an OB/GYN since July.

This was my first month on Clomid, judging by my temps, cervical mucus, and OPKs I ovulated somewhere around 5-8 days ago. I got a progesterone test done which confirmed that I ovulated but my doctor wanted to see my number a little higher.

Well anyways last night I experienced this weird cramping that I never felt before. It almost felt like a pressure in my abdomen and cramping really, really low... like practically in my cervix. Could this have been implantation cramping? It came and went all day then lasted for about an hour at night now it's gone. Is this from implantation maybe?