My girlfriend is having an abortion and I've decided to make it a party! If you're interested in coming, it's at the top of the stairs. Don't tell her though, it's a surprise party!
Those plans to suprise your girlfriend does not sound right. Does your girlfriend have any clue about what you are planning?
No, she won't. She's coming out of her room in a minute. I think she is going to the bathroom.
It sounds to me like the "party" you intend on having should be avoided. It's not right to do something to harm your pregnant girlfriend in anyway. Instead, if you and your girlfriend disagree on her pregnancy, you should talk to her about it.