Hello
Venus is the 5th lord in rasi. Venus is with mars, the badaka and aspected by saturn, a kroora.
venus is afflicted by same grahas in navamsa too.
5th house in rasi is aspected by three krooras , namely saturn , rahu and mars.
More than navamsa, another divisional chart called saptamsa should be seen for progeny matters.
Saptamsa lagna is occupied by saturn and mars. But jupiter and sun placed in 5th house can bring in children.
How long have you been married ? what is the marriage date ? your partner's chart will also hold key for progeny.
i will write more.