There won't be a bad ending or anything else
the stuff just happens sooner ( and more romantic ) if you followed the preggo path. That doesn't mean that it's locked to that path in order to
marry someone.. 0.14 was focused a lot on Sandra being pregnant ( telling everyone about it etc ) so depending on if you wanted her pregnant or not, the update played very differently. You only missed a few events if you didn't make her pregnant for example, but a lot of dialogues were different if you did.
The whole morality aspect is wrong by the way. MC was just looking for legal advise, he doesn't really care about morality. Since he plans on marrying more than one woman he had to check with Elaine if that is somehow possible legally. He would do it anyway, morality is not an issue for him anymore. Doing it the 'old way' like Elaine said is just speaking that MC wants to do it like a normal person would - the relationships don't matter, what matters is that he wants to do it right, legally.