I have a DD already but I honestly can't remember having felt implantation occur and I don't think I ever had any spotting. All I remember is cramps a week or so after period was due (already knew I was pregnant), which I believe was just my body getting everything sorted so to speak!
TTC for DC2 and currently 5dpo - has a persistent heavy feeling in my tummy that I usually feel before my period is due but not due until the 13th.