Ok naman except almost placenta previa ka, hopefully as baby grows and the uterus stretches, wag matakpan internal os mo. Follow ob advice on prenatal care. 21 weeks is too far na to be accurate, so better recall your lmp kasi mas reliable yon. Anyway sa panganganak naman, kung nsd ka, di mo naman usually mako control kung kailan ka mag labor.
Kristel Joy Sudario