BFP 9 days before period was due

Bre

I got my BFP 9 days before my period was due. Seems so dark for so early.. my OB assumed I was actually 8 weeks but yesterday with my dating ultrasound it’s confirmed im only around 4 weeks 3 days! First pic is 9 days before missed period second pic is 3 days after missed period. I’ve never experienced a positive this early? The baby isn’t even visible via a transvsginal ultrasound yet. Has anyone else experienced this?? I’ve been pregnant 3 other times & never in my life have I got a BFP 7 dpo???????????