Please please help! Prayers welcome!

Hi, I believe I OD'd around 2 weeks ago. I started testing earlier this week and was excited to see a very very fain BFP on FRER. This was also confirmed on the test at my drs office. However, I have been testing almost daily and every test has a faint line STILL. My first bfp was Tuesday. It's Saturday now. Has anyone experiences this? Does it take a while to turn dark? The lines aren't getting fainter but just keep the same. I am praying this is not a chemical pregnancy because I already had a miscarriage and don't want to be sad again. :( Is there hope?