So on the 6th to the 8th of this month I had what I thought was implantation bleeding along with some slight cramping. My period was due on the 12th but I haven't had it yet and I've got no signs of her coming any time soon. I've taken 3 home pregnancy tests and they've all come back negative.

What the heck is going on? Could I still be pregnant? Is it possible to get a positive reading later on in the pregnancy after getting negatives?