Negative help plz

Alexzandria
Ok Well my period was three days late! And I have never been late! Ever! It's usually right on time! Anyways so I got it three days late and then when I started it was really light an I'm not one to have a light period. Oh and It only last 3 days.??
I waited and took a pregnancy test but it came out negative. Now is this normal? Could I be pregnant and that was implantation bleeding? If so could the test be wrong? Wat should I do? Because I feel like I have most of the symptoms of pregnancy but the test came out negative. Should I wait a bit longer and take another? Help plz? Opinions anyone?:)