The Mom, Sarah, gets impregnated in the game as the story advances.
It is a choice that both Sarah and the MC make as an expression of their love - their 'Sweet Affection.'
It is a slow burn story in that it takes time for their relationship to get to the sexy times and actual pregnancy, but it is perhaps the sweetest journey I've found in an AVN that actually gives you adult physical relationships.
If you try playing, I recommend downloading the LQ option (~ 9GB +) as it is about 1/3 the size of the HQ option and you will only notice the difference between LQ and HQ if you have very high-end gear.
Also, once you download the AVN, patching it every month is easy and a Much smaller download.
If the primary thing you are interested in is pregnancy content, then this AVN may not be for you because it is first and foremost a story driven AVN and pregnancy is a consequence of the story of the growing love between the MC and Sarah.
There may also be other pregnancy content coming, but the pregnancy with Sarah is already in AVN.
IMO, it is worth a download to try it out and see if you like the story and the way the MC builds his relationships with both Sarah and Shannon (his sis) as well as the other women.
If you enjoy it, you have found a gem with a Lot of content, and if not - that is also okay.
Every AVN is not for every person - and there is nothing wrong with each of us having different tastes.
Cheers!!