I doubt it. Kreia doesn't seem at all like someone who'd be willing to get pregnant, and at her age it would be impossible.
Let's look at it: Kreia is in her 80s or so by TSL, yes? The Handmiaden is what, in her early 20s? That would mean Kreia gave birth to a child in her mid 60s.
Pretty difficult to have a kid when you're only a few years away from being a senior.
Besides, who the **** would would do anything even remotely sexual with a 60-year old Kreia? If Yusanis had, it was likely to the Force. If Kreia would go to the effort of bending his mind, why give the child away?