I overheard my co-worker saying some really hurtful things about my pregnancy behind my back. How do I not take it personally?

It's hard because I really thought she was a work friend. I was in a supply closet and I heard her talking with another person. I didn't want to eavesdrop but I had no choice.

There was a lot of back and forth but she said something like, "Can you believe Hailey's pregnant? Someone actually got her pregnant. She should just abort it. She's going to be a horrible mom. Can you imagine her with a baby?"

I'm really hurt because she knows I'm married and want kids. She even told me she couldn't wait for me to get pregnant. She was so excited when I told her.

I feel awful because she's the one person I trusted there. I don't know who I can trust. It's just crushing.

Edit: I'm just trying not to take it personally but it's so hard. If I thought she was my friend and she talks about me like this, what do other people say? HR won't do anything. It wasn't said directly to me and technically I shouldn't have even overheard her.

She didn't know I was in the supply closet. She couldn't have known I was in there because it has two doors, so she didn't see me enter it because she was in the hallway that the other door is connected to. It's a shortcut to go through the supply room but you can't see the supply room or where I came in.