Implantation bleeding?

Hi. I have irregular menses, so i would ususlly use apps to track my period. Most of the time, my period will come around the date or delay a few days. However, this month i have experienced light bleeding 12 days before my expected period (as per apps, it should come on 20th Apr). The light bleeding doesn't require a pad, panty liner will do and it lasted for approx 3 days. When I pee, there isn't blood. But when I use tissue to wipe, is light light coloured blood and sometimes dark + light cramp. I'm just wondering if this counted as implantation bleeding? What should i do? #Myfirstbaby #pleasehelp #advicepls