Should a planet be affected by celestial portents, or defeat by malefic at the
  
time of intercourse, miscarriage may take place in the month ruled by the planet concerned.
  
The Ascendant ruling at the time of intercourse can also become cause of miscarriage. If
  
Saturn and Mars be in the said Ascendant, or the Moon be in a House of Mars, or Saturn, the
  
results mentioned will come to pass.
Adversities to the Pregnant Woman.
  
If at the time of Adhana the Sun and the Moon are hemmed between two malefics, while the
  
Ascendant has no benefic aspect, the female concerned dies. The same effect prevails, if the
  
said Ascendant and the 7th are occupied by malefics and be without benefic aspect, or, if the
  
said Ascendant is occupied by Saturn and weak Moon aspected by Mars. Again similar
  
effects shall come to pass, if weak Moon and the Sun are in 12th, Mars in 4th, while Venus is
  
between two malefics. Both the child in the womb and its mother leave this world, if malefics
  
occupy the 4th from the said Ascendant, or from the Moon, while Mars is in the 7th, or Lagna.
  
The same result follows, if Mars is in 4th, Sun in 12th and the Moon be decreasing and be with
  
malefic aspect. If the Sun is in Lagna, while the Moon is weak, or, if Mars is in Lagna, while
  
malefics are in 12th and 2nd without benefics aspect, death occurs of the mother along with
  
child. The Sun in the 7th at Adhana, while Mars is in Lagna, takes away the child along with its
  
mother through instruments........By...Kalyana Varma..