Ay, nakakabigat yan na mag-worry, especially with spotting pa, right? Six days delayed with a negative blood test is usually pretty reliable, blood tests catch hormones earlier than urine tests, pero kung nagkaroon ka ng spotting bago ang expected period, that could be implantation bleeding, and honestly, a few of us moms went through something similar kaya alam ko kung gaano nakakaanxious ito. I'd really suggest follow up with your OB na lang, especially since may spotting ka pa, they can do another test or check kung what's going on with your cycle, kasi sometimes stress or other factors can delay things din talaga. Sending you calm vibes, mama, hopefully makakuha ka ng clear answers soon!