Question about faint lines.

Juanita👼👼👶👫💙👣 • 2 miscarriages under my belt and on my heart. Currently 39 weeks pregnant. God is good!
According to glow I ovulated around valentine day, my period was due on the 1st and I got my very first faint bfp the day before my period was due. Now 4 days later I'm still getting positive but they're barely getting darker. Is this normal?