I Became the Academy’s Genius Shikigami Summoner

I was excited at first after reading the description, but was instead shocked that this mc is fucking insane in the head, also pretty not smart.

Go to novelupdates. There's a harem tag in there. You're welcome xD

Well, it is a professional book so it'll be a harder read than webnovels.
It's better to first read some actually good WNs and when you got better at, come back here.
And for those parts that she loses to her instincts: they are written like that so they won't have coherent structure and meaning, all so it can convey her inner turmoil.

Lol... Pinning a pregnancy on your husband? I really can't wait to see how this love triangle plays out