Looking at your horoscope in detail. Please note that 5th house lord Venus and Jupiter which is the significator for children is combust in your horoscope, therefore delay on this part has been there. However the period before September 2015 is quite strong for having a child as per your horoscope. Presently Jupiter is in Pushya Nakshtra in its sign of exaltation. You should try during this period however if you still are not able to get desirable results, then it will be better to get a a medical opinion.
Doing the Following remedies will truly help.
1. Donate something white like Milk, Sweets, white clothes in a homeless centre especially for children.