It does have 2 pregnancy arcs I think.
1 is basically a dairy cow path, with 3 scenes (getting impregnated, and then 2 more scenes with preggo belly & milking). The other arc is just a fat man having the sperm piercing egg during sex, nothing else in that arc I think.
Beyond that preg isn't much of a mechanic. Some of the scenes account for variations for preg belly. There is a "births" counter, but not really sure of the point, no random sex actions seemed to get her pregnant and there was no birth CG (maybe, there is a weird octopus scene, but I think she is masturbating with it rather than delivering it).
Haven't played the game because the "game" sucks pretty bad.