Honestly I think you should do whatever you feel like doing when it comes to your body.
HOWEVER, you should try and talk it out with them, just so that they know what's going on. But be direct and don't let them sway you into changing your mind.
Should you get an abortion without telling your significant other?
Hi Sara,
this is quite a delicate situation but I think that when it comes to these things it is better to talk about them with someone, especially your partner seeing that he is directly involved.
This doesn't mean by any means that he has to decide for you or prevent you from doing what you want to do. As Nikki said, you have your own body and you should be willing to decide. Having a baby is a serious thing and abortion is a delicate issue.
As you have the right to decide of your own body, I think that your significant other has the right to know and at least have his say on this. You obviously are the one who is pregnant, but he is also part of the reason why you are, so it's a thing that involves both of you. Making decision without at least talking to him doesn't seem like a good idea but that's just my opinion.
Talk to him and listen to what he says. If you are convinced you don't want to keep the baby, in spite of what he says then try and find a solution. You said though, that you think you're both not ready but how can you know that if you never talked to him? Technically he is the father so I guess he might also be willing to give you his advice.
Hope things work out well for both of you and, eventually, this potential baby.