Trying for first child

Bdelgado2012

Good Morning I’m currently 12 days past due for period I ovulated one the 16th of January...last period was January 1 however I just had some light blood on toilet paper could it be implantation bleeding? I took two test and they were negative but I have heard of false negative my Obgyn told me it could just not register HCG in urine yet...any information would be greatly appreciated!!