I can only imagine the uproar.
Literally fucking up the whole academy of new heroes for the city. I also don't think dev wants to write miscarriage. The chance that someone is pregnant and then gets a smack with a lamp post like harper at the beginning leads to that being a very likely scenario.
My guess as of now is Riley is definitely on birth control since she is not with her husband anymore and that thought of "start a family" would be back there with him, and her new thought of continuing on her super hero career would be at the forefront.
Valentina being the very logical person would obviously be on it as of now, since she planned everything for the sex with MC anyways, and I would think that she with her dislike of wasted potential would think that being pregnant now would be a waste of her potential.
Missus Powell as of now is not banging MC, and how her home life is or what she does in it is outside of our knowledge. Maybe she is on birth control, maybe her husband had a vasectomy, who knows.
Chrys would not chance it as of now, MC barely got away with "being engaged" which the mother knew was a lie. Her mom would kill her (figuratively), and kill the MC (maybe literally).
Harper is unknown, umm maybe she can shield herself? Maybe birth control.
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Maybe much deeper towards the end of the game, but definitely not any time soon.