implantation bleeding around AF?

Danielle
Have any of you ladies have light bleeding around the time that AF is supposed to show and then test later and found out you were pregnant? I have had like light brownish/pinkish bleeding and I normally don't get this before AF and I had slight cramping a few days and backaches some other day? Just curious as to what most of you have experienced before finding out you were expecting. And if anyone has been through this?