Implantation? Or am I crazy?

Kaitlyn • 💙❤ Johnny Thomas ❤💙 02/10/17 💜💜 Angel in Heaven 💜💜 01/14/18 💖💖 Emily Joy 💖💖 01/26/21
On Saturday, 5/21, I noticed there was brownish blood on my underwear haven't seen it since then and I'm a day late on AF. Could it have been implantation? Or am I just getting my hopes up!?