I'm going to make my friend take a contraceptive
Why do you think that contraceptive is so important for them to take?
I do not want my friend to reproduce so I will give them a contraceptive without them knowing it
You have no business in anyone's reproductive decisions. You are infringing on a person's personal rights and it is wrong to force someone to take a contraceptive. You could be arrested for violating a person's rights in this way.
I can't accept that my friend is having kids when they should not have kids.
Unfortunately, that is not something for your to decide. I think that it is wrong to try to force people to do things like that.