Late implantation?? 8 days late for AF

hi y’all! so about 3 months ago I miscarried my 9wk pregnancy. since then I haven’t been really tracking ovulation but my periods have been mostly normal. my bf and I are very sexually

active and we don’t use protection. my last period was June 28th so my period is late by 8 days according to the app. on the 1st day of my missed period I took a test and got a BFN. second test at 5 days late was defective. yesterday there was some spotting when I wiped (very light pink) so I thought my AF was here and 8 hours later there was absolutely no more blood. I woke up this morning and there was a tiny bit more spotting but still no AF. last night I was experiencing mild back pain and super light cramping on my right side and spotting is not normal for my AF. I’ve only experienced spotting during my last pregnancy. is it possible for implantation to happen 8 days

after I missed my period? did I possibly ovulate later than usual? someone help meeee lol. thank

u in advance. 💕