Implantation bleeding 2 days before period?

Katie
So I got what seems like AF 2 days before period was due. I had a positive opk 12 days ago. I've had tender nipples, for more than 1 week, horrible indigestion (feels like phantom gall bladder attack), nausea, and painful gas since early yesterday. All similar symptoms to my 1st pregnancy
So, my question is, has anyone had period-like bleeding and then gotten a BFP, or know someone who has?