Your baby can drop at any time during pregnancy. As for being dilated and effaced, its not uncommon to stay dilated at a 1 for afew weeks.
I've had it since about 33 weeks, I'm 37+3 now and still no baby boy! You wanna wait until after the 37 week mark as much as possible also because your baby's lungs aren't fully developed and they'd still be a premie.
Any day hopefully :) I'm 34 weeks 4 days and I'm 5 and a half cm 80% and hoping to meet my prince any day now