The sides have some information on the sperm donor, and thankfully they don't appear to be going down the 'ridiculous' road (like, Stan and Zoe met, got drunk and had a one night stand but didn't remember it and the next day she goes and gets inseminated without realising she was already pregnant, then goes off and 'meets' Stan (again)- the man of her dreams - type of thing

). I think you'll find it's exactly what it says it is. Unless there's some major plot point left out of the sides, which could happen because, naturally, there are no scenes just between Stan and Zoe in the sides.
And this doesn't appear to be the typical rom com either; it's a little crass in parts and definitely has it's funny moments and although it will no doubt follow the 'formula', I really hope it has that little something extra (besides Alex I mean).