Has anyone had implantation bleeding?

Would love to hear YOUR experience with implantation bleeding.

I am pretty sure I conceived and am having implantation bleeding. My period is due tomorrow. I'm having light pink spotting (unusual and my periods come full on within hours of beginning).. I have a bit of cramping but more of a sore back.

I had my sister feel my stomach as it is hard and swollen and even she asked if I was preggers!