Can you have IB (implantation bleeding) AFTER a positive? Read description (I know it's normally during)

I had implantation bleeding with my first pregnancy. Very pale pink maybe over 1-2 days, only when I wiped. This was probably 2 days before my missed period. I tested VERY positive when period was late so in theory might have got a line earlier, if I tested sooner.

This pregancy no implantation bleeding. Initial positives 8-9DPO (confirmed with bbt). 3 days after this, brown discharge when wiping. At the most 3 times spanned over an evening/next morning.

Is it possible that I bled when the embryo was implanting but it only came out 3-4 days after? It was old blood, so maybe it was delayed but caused by implantation??