Implantation bleeding or menstrual cycle?

I had sex a couple weeks ago possibly (3 or 2 weeks ago) and my period is supposed to come today May 3rd and I did get it today but I didn t know about the implantation bleeding, I didn t know you could bleed if you were pregnant. I m not sure if this is my menstrual or implantation, how do you know if it is?
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