Hi N2L-
I had no cramping other than an hour of bad cramps (like bad period pain, it woke me up) one night, I think it was 4days post a 5day transfer, so theoretically about 9DPO. This became a bfp so I beleive it was implantation, unfortunately it didn;t stick. Other girls I know who got bfps had cramping a lot over esp over the 2nd week of tww. Good luck, I hope its a good sign!! xx