Looking at your horoscope we see that your 5th house which is the house of progeny is ruled by Jupiter as Sagittarius sign is there. 2nd house is the house of family growth, It is ruled by Mercury.
In your natal chart we see that Jupiter the 5th lord is combust. In your Saptamsha chart (D7) which is the divisional chart for children, we see that Mercury is debilitated in the 5th house and 5th lord Jupiter has aspect of rahu.
Your 5th house and lord is weak for children. It is better to seek medical advice and if you have already taken that but no help, then you can always look at adoption.