<human>: I've been working at our company for just shy of 6 months. I love it and I'm moving incredibly fast. I'm not particularly close with anyone, but close enough. Last night, Rose showed me a pregnancy test and giggled and said she was going to have her pregnant sister pee on it and show it to her boyfriend and keep the prank going for a few days. Rose's best friend was next to me and laughed as well.

I didn't say anything. I wish I had. I'm extremely Pro-choice whereas these two are prolife and I'm positive her boyfriend is too. I know the boyfriend decently well and I can only imagine how betrayed he would feel by her doing this. I have a feeling that he would possibly end their year relationship over it.

Should I just let this play through, or talk to one of the girls about? My boyfriend said I should warn the guy, but I know this would cause drama in the workplace.

Can you provide a brief overview of the text?
<bot>: coworker is having her pregnant sister pee on a pregnancy test to fool her boyfriend for a few days. I think this is wrong and he would break up with her. Do I let it happen or intervene?