Period vs implantation

Heather • Mom to 19 month old, wife to the love of my life and best friend, and TTC #2!

I am 12 dpo. AF was due later this week. I don't want to be gross, but it's dark brownish and watery. And it was a lot at once, and then had already pretty much stopped hours later. I so badly want to be pregnant. We've been TTC for 4 months now. Really have been FEELING pregnant but tests are still BFN.

Thoughts??????