Harem will be exclusive of some routes and decisions. But yes, it will happen. There'll be a solo route for each maingirl, and regarding pregnancy... don't have high expectations, but if it happens, it'll most likely be in the epilogue of some routes.
I understand that is probably the easier route for pregnancy in AVN's but it is a little disappointing. I have seen that but out of the many AVN's I have played I have never seen it show the process of moving through the pregnancy which is a little sad because I think it would be much more immersive if it did. Which I can only speak for myself but I have no children and long ago I wanted that very much and it may sound weird but that immersion could give people like me at least maybe a little of how it feels to have children. Hahaha I probably sound crazy.