confused??

i had my period on 2/03 to 2/07 and had sex on 2/07....I know i have been stressing A LOT lately.. today i went to the bathroom and when i wiped there was light red/brown discharge. is this implantation bleeding? i thought implantation bleeding doesn’t start until after ovulation and before your period... or could this just be from stress..? according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> app i start ovulation tomorrow on the 15th.

idk what’s going on..