Happened to me too..twice (m/c,chem mtd)

Hey BD...yes...it could be anything but my guess is implantation cramping and not the Crinone since it came and went. This last cycle I was on Crinone and was expecting to have horrible cramping because that is what happened to me in the past. What happened instead was that I only had cramps 7DPO...like you...and it was indeed a BFP..albeit a chemical. In my M/c cycle I had cramps 6 and 7DPO and then nothing and then cramping again a few days later. Hang in there...you are very much in this!!