Eh sayang, if you've missed your period for 3 weeks and got faint lines twice, you really should see a doctor or go to a clinic ASAP, they can do a proper blood test to confirm, okay? Jangan tunggu lagi. A few of my mum friends dulu also had the same situation with faint UPT lines, and honestly it made them so stressed wondering, but the doc sorted it out quickly with proper testing. The waiting is the worst part, I know, but don't delay lah. Go see someone today if you can!