You should not let your battery get below 12.1, or even spend a lot of time there. That is about 50% charged.
If you are leaving in a few days, and can charge on the road, it's not a big deal to charge it now, but charge it soon and don't run it down any further. You'll have to charge it while driving, or it will be too low to use when you arrive.
I only exaggerate enough to compensate for being taken with a grain of salt.