Why should an insurance company fear the pregnancy in India?Is it too dangerous ?

In Ahmedabad,Realiance life insurance company has rejected a woman’s application for life insurance on the reason she is pregnant more than five months.
She is working in a hospital and doing her medical check up regularly and till now no other medical problem.
All other insurance companies are also keeping this policy?
Now a days pregnacy death is very rare.
Why should an insurance company keep 19 centuary belief?