Hi Mumma Mia!
With DS1 I tested when AF was due (Cd28) and got a BFP straight away of course. With DS2, my cycle was all over the shop so I am not sure what day I tested but I got a BFP straight away. I usually get nausea early on and implantation spotting, so I know that I am pregnant before POAS! I am 6 DPO and I am having low level nausea. I dont recall having it this early any other time- well, as I said, I am prob coming down with something!
My fingers are crossed for you! I am looking forward to hearing that you have a BFP.