A temp drop and cramps could be your period, it could be implantation, or it could be neither. Take a look at my last chart. I had a major temp dip at 8dpo that I secretly hoped was implantation, but it was nothing.
I've found since ttc that I get cramps and sore boobs every.single.cycle during my 2WW. I had never noticed before and the first cycle we were trying, I definitely thought I was pregnant. I wasn't. Try not to read into every "symptom" or you'll drive yourself crazy.