In the horoscope of your husband 5th lord Jupiter is with exalted Ketu. Saturn aspects the 5th house of children. In your horoscope debilitated Rahu is in the 5th house. 2nd lord Sun is debilitated in the 4th house of family happiness. The charts are weak on the progency front. You can go for adoption, there is no issues. You should do all legal formalities that are needed for the same.
Blessings,
Navneet Khanna
Astrologer