How can I know if it’s implantation bleeding or just my normal period?

So i’ve been delayed for 2 weeks then I suddenly released an unusual amount of brown discharge then right after that, I released blood (it was somehow dark red) and it lasted for almost 7 days. But if calculated, the number of napkins I used a single day is only ONE. The amount of blood I release is not the same as the blood I release on my ordinary period. So is this implantation bleeding or not?