It's very normal for babies that are not your first to NOT drop prior to the onset of labor.
How fast were your previous labors? Typically, labor contractions aren't close enough to birth a baby until they are CONSISTANTLY 2-3 min apart and if you haven't had a lot of bloody show yet, you still have (typically) plenty of time to get to your place of birth.
If you feel like you're having a lot of contractions & are not sure if "it's time" yet, you can put your feet up, take lots of deep breaths & drink a full glass of water as quickly as you can manage to. If it's just contractions caused by activity, this will typically stop them.
If, however, you notice that tell-tale labor pattern of LONGER, STRONGER, CLOSER TOGETHER is becoming very consistant and you're starting to get bloody show, etc...then it may be time to go. (Keep in mind too though, as I'm sure you remember, that "bloody show" *can* show up after cervical checks, sex, etc... too.)
I think that it's really important that you just listen to your body more than anything else. Trust your body & trust your baby. Your body knows how to birth & your baby knows how to help him/herself be born.
Good luck, enjoy the rest of your pregnancy & have a wonderful, beautiful, empowering birth!