Aw, understandable ang worry mo, lahat kami nag-aalala pagdating sa biometrics! From what I know, slight variations sa HC at BPD compared sa AOG is pretty normal kasi bawat baby talaga has their own growth pattern, pero dahil medyo significant yung difference mo (4 weeks vs 2 weeks), mas better talaga na i-discuss mo ito directly sa OB mo para ma-assess kung may underlying concern or kung normal lang talaga sa case ng baby mo. A few of us mums nag-share din ng similar concerns before, at mostly reassuring lang ang OB after thorough check, so don't stress too much but do bring it up sa next visit mo, okay?