First time pregnant

Sara
Had my BFP on Wednesday with 3 different brands 
Yesterday I started to bleed very lightly and only there when I wiped after going to the toilet. It only lasted a few hours and has now stopped
Af due tomorrow 13th 
I've booked in privately to have blood work to confirm I'm pregnant still today as I live in the uk my doctor won't do s blood test to confirm pregnancy
I'm nervous they'll say I'm not after the bleed
But it was hardly anything and I just poas again and the line is getting darker 
What do you ladies think ?