Implantation discharge?

For those of you who have experienced implantation discharge or bleeding, what was it like, how long did it last and what DPO were you?

I'm either 12/13 DPO and noticed some minimal thick, light brownish discharge earlier when I went to the bathroom. I've been having mild cramping on and off since about 5/6 DPO, tender/swollen boobs, nipple changes, milky cm, and staaarving.

Waiting until missed period to test. Expected 1-3 days.