Why is this happening?

Lydia • 5th ER cycle 7 transfers later… Currently pregnant with baby girl 💕

So I had VFL leading up to AF 2 days ago. Day of af got a pretty clear fp on a frer. Got my period normal/ heavy flow going on 3rd full day now. Tested after work just now to see if line went away. Got this effing positive pink effing line. Will this go away? Y is this getting darker? Wtf?

Today

Day before period....