Two studies of umbilical artery Doppler velocimetry [58,59] in prolonged pregnancy indicate that it is of no benefit. In a small observational study comparing the predictive values of CTG, AFI, biophysical profile scoring and the ratio of middle cerebral artery (MCA) Doppler to umbilical artery Doppler, Devine et al.  found that the MCA Doppler to umbilical artery Doppler ratio was the best predictor of 'adverse outcome' in this study, defined by meconium aspiration syndrome or Caesarean section for fetal distress or fetal acidosis.
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The first trimester is very important for the mother and the baby. For most women it is common to find out about their pregnancy after they have missed their menstrual cycle. Since, not all women note their menstrual cycle and dates of intercourse, it may cause slight confusion about the exact date of conception. That is why most women find out that they are pregnant only after one month of pregnancy.