ovulation bleeding vs implantation

hi guys! my app says i’m ovulating (which i know is just a guess) but i’ve been bleeding off and on for the past few days. yesterday i bleed enough to put a small tampon in. is that normal? could i have just started my period early?

also, can you tell me the difference between implantation bleeding and ovulation bleeding? when would implantation bleeding happen? my blood is bright red and yesterday is was thick, today it’s dark red