Implantation bleeding?

Ericka

I have always been very regular in my periods. Every month it’s always the same thing. Always on time and always the same flow. Well I started my period 3 days late and it only lasted like 2 days. It wasn’t as heavy as usual. So is it implantation bleeding or what? Should I test or should I just go on as normal? If I test, how long should I wait?