Plot Hole

The baby Stella's carrying can't be Nathan's owing to the fact he has had the snip at least according to stella season one where she thinks Kim is about to top herself as she so fittingly suggest to Dale Kim is looking for evidence and she says she's on t'pill .... well anyways she says nathan had t' snip......... so answer that.....

"They live as though they'll never die and die as though they never lived..."