AITA for kicking my fiancée out of the house after finding out she lied about being infertile?

My fiancée (30F) and I (33M) have been together for four years and engaged for one. Early in our relationship, she told me she was infertile due to a medical condition she had in her teens. I was fine with this, as I’ve never really wanted biological kids and figured we could explore adoption if we ever changed our minds.

Fast forward to last week. I came home to a positive pregnancy test sitting on the bathroom counter. At first, I thought she might’ve been helping a friend, but when I confronted her, she broke down and admitted she’s not infertile. She never was. Apparently, she lied because she thought I’d leave her if I knew she could have kids, since she knew I didn’t want them.

Here’s the kicker: she says she stopped taking birth control “a few months ago” without telling me because she wanted to see if I’d change my mind about fatherhood if it “just happened.”

I was furious and told her this was a massive betrayal. I feel like my trust in her is shattered. She argued that she did it because she loves me and wanted us to have a deeper connection through a family. I told her I needed space and asked her to leave the house.

Now she’s staying with her sister and texting me nonstop, saying I’m overreacting and being cruel by “kicking out the mother of my child.” Her family is also chiming in, calling me a deadbeat dad for “abandoning her” during pregnancy.

I’m struggling because I never wanted kids, but now one is on the way, and I feel trapped. At the same time, I can’t get over the fact that she lied to me for years and manipulated me into this situation.

AITA for asking her to leave, or am I justified in needing time to process this betrayal?