Ay, I understand the worry kasi uncertain lang talaga yan! A negative test one week after missed period can happen, sometimes it's just too early pa or the test didn't catch enough hCG, or sometimes the cycle lang shifted, but honestly, if it's been that long na walang regla, best thing is to see your OB para sure na, kasi sila lang talaga makikita ng malinaw through blood test or ultrasound. A few of us tried retesting after a few more days or going straight to the clinic para walang stress, and that's really the peace of mind you need right now.