I wouldn't say happy, no. More like "I told you so." This is what happens when someone like Palin forces her "abstinence only" platform on teenagers, rather than teach them about real sex education. Abstince only on teenagers who are discovering all sorts of new things and whose hormones are going crazy is like trying to teach abstinence only to bunnies in a carrot patch.
If there's one thing to actually be happy about, it's that at least two unprepared teenagers aren't going to be forced into a shotgun marriage on top of everything else they have to cope with from being very young parents. The baby's here, and Bristol will have enough to deal with being a teenage mother. The last thing either of them needs is to try and force a "happy" marriage they're not ready for.