Once Justine has been unfaithful, they lose the True Love Protection until they “make up” when it was restored. Their child was conceived in True Love so I doubt it will be a Whamp, it may indeed be feeding on the constantly renewing True Love, making it a Cupid. Pre- destination? Whamps are virtually sterile, they used contraception, and the True Love Protection should kill any hunger infected sperm at conception. That was one hell of a determined hard to kill little swimmer, unless there was divine intervention giving them a hand. I have an image of Uriel brandishing a pin.
Justine is six weeks pregnant, the timing is all wrong for a Etri based on Bombshells.
Harry really needs to look at Justine through his third eye, it will probably give him a clue to curing Thomas’Hunger.