Well, much like True Blood, the source material and show really vary pretty significantly, so I wouldn't really qualify any discussion of the comic storylines as spoilers. Shane gets killed very early on in the comic, so they have long since left that in the dust. If you're still keen on reading the comics that's cool, but those things have been around for years so it's hard to spoil something that stale to begin with. But ya, will try to be more careful in the future, sorry.
Kirkman basically said he is letting the storyline develop organically, and has not committed to any particular continuity from the comic, so I think we'll continue to see some significant divergence between the two.
SO why was Rick surprised to learn Lori was pregnant if the doctor told him back at the CDC?