Ay, makakahanap ka, mama! 5 weeks delay with negative tests is definitely confusing, lalo na kung regular ka talaga, honestly, I'd suggest getting a blood test na lang kasi sometimes mas sensitive siya than urine tests, or maybe consult your OB para ma-rule out kung ano talaga ang nangyayari (could be stress, hormonal changes, or something else entirely). A few of us in our mum group went through similar situations and nakita nila na sometimes it's just our body playing tricks, pero important talaga makipag-check sa doctor para ma-ease your mind! Fingers crossed for you, and congrats on your baby boy, that's so sweet!