No worries, you’re not annoying! Unfortunately though I don’t really have any concrete headcanon’s regarding N’s pregnancy with Oliver since I don’t think there was anything particularly remarkable about it. Oliver was a planned baby, and things progressed smoothly! All the “more interesting” things happened with the twins, since they were an accident and Hilbert and N weren’t technically dating at the time, so over the course of the pregnancy is when they establish their relationship, not to mention all the fears they (especially N) had regarding becoming parents for the first time. By the time Oliver is born, they’re married and in a much more stable relationship, plus they’ve got more experience with what to expect after the twins and after their friends had their own babies!

I just tend to have more hcs about pregnancies if there’s something more happening around them or something out of the norm, like relationship drama, unusual circumstances, etc. All of that sort of thing only happens before and after Oliver is born (as he’s a reincarnation and that has its own brand of baggage).