Not sure if my sister is ready for this baby

ok so my sister is 18 and she is prego. she is due in like 2 weeks and her boyfriend is totally supportive (btw he has 2 kids already and his 23 o those kids arent her's) they have been together for almost a year and 1/2. Im so nervous that their deff. not ready for this baby how should I tell her this? im pretty straight forward person and just say what I mean b*tchy or not but this is more serious so I need sum help.

Say what you want to her - but I doubt its going to change anything.

I think you should have thought about this before now. It's a little late to talk to her now. And I doubt she would listen anyway, not because she doesn't care what you say, but because she probably really wants this baby. The best thing you can do is support her no matter what she does (whether you like it or not) and be there to catch her when she falls. Let her live and make mistakes on her own. I know how you feel and sometimes I have to bite my tongue to keep my opinion to myself but, it's more than likely for the best. If she was doing something dangerous or if she were younger, THAT would be a WHOLE DIFFERENT STORY. But she's a adult. Good luck.