Prashna lagna shows your desire will be fulfilled. As Cuspal sublord of first house is Saturn placed in 11th house in Prashna lagna but retrograde + Saturn is aspecting moon, your desire will be fulfilled post delay once Saturn turns direct.
Below are sometimes that seem plausible for conceiving with gods grace (please continue sincere efforts and get treatment of a reputed doctor as astrology cannot replace medical science; try to change your current doctor if you have any.
1) 10/8/2017-30/8/2017- slim chance
2) 28/9/2017 to 20/10/2017- decent chance
3) 24/12/2017 to 5/3/2018- best time astrologically
May god bless you and good luck!