Sayang, I understand this must be worrying for you. Femur length measurements during pregnancy can vary for different reasons, sometimes it's just how baby is growing, sometimes there are other factors. Pero really, you need to have a proper follow-up chat with your doctor about this, okay? Jangan worry sendiri dulu; let them explain what it means for your situation specifically, sebab only they can see the full picture of your scan. Trust your doctor to guide you through the next steps. Sending you hugs, you're doing the right thing by checking further.