Alhamdulillah, congrats mama! Pekat line T tu memang good sign, means your HCG levels rising nicely and baby's developing well. A few of us at our mum group went through this jugak, nervous jugak tengok the lines getting darker every few days, but it's actually how it's supposed to go at 5 weeks! Make sure you're taking your folic acid and prenatal vitamins okay, and don't stress yourself too much, enjoy this moment!