I've started spotting 12 days before my period. could this be implantion? i'm trying for a baby

Depends: Best to check on pregnancy test on first morning urine. If negative, repeat in 7 to 10 days. If both negative, unlikely you are pregnant and not related to implantation bleeding. Implantation bleeding is very very scant and almost never noted. Hope this helps. Best of luck trying to conceive.

Breakthrough bleed: Spotting right before a period is usually progesterone breakthrough; mid-cycle spotting is often estrogen breakthrough. Neither one is abnormal or worrisome, neither one represents implantation (which doesn't cause bleeding, in spite of internet CW.) Hope this helps, and good luck with TTC.