Lines aren’t getting darker 😕

Tabitha

Hi ladies! I got my BFP Sunday morning. It was pretty faint but it was there! I’ve been testing every morning since then and the line doesn’t seem to be getting any darker. I scheduled a blood test on Thursday to confirm the pregnancy but I’m starting to get worried. Aren’t your hcg levels suppose to double every 24 hours? How come my lines aren’t progressing? Does it take a few days?