Nat: Don't loose hope yet hon, my FS told me that FET embryo's do take longer to implant compared to fresh. Those HPT's can be nasty little things sometimes. I got cramping on my Fresh BFP cycle and but never did with my negatives, it was more just a heavy AF feel not actual cramps. So the fact you felt soemthing is a very good sign hon . What day is your BT?