spotting on 12dpo, negative test on 13dpo

Julia

i‘ve been having some very light pink-brownish spotting on 12dpo exclusively, which i‘ve never had before. my period is due around today, i however tested negative today (13dpo). additionally i had some cramping around 10dpo, which i thought were premenstrual symptoms. no other symptoms. could it be implantation bleeding? ttc for 9 months with an almost 2-year-old. how and when did you experience implantation?