how long after you drop does it take for baby to usually come?

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So my belly has definitely got lower and I feel like it's been consistently lower for a little bit it used to go up an down now it has kind of stays in the low position. And my doctors appointment Tuesday my doctor said the babies head feels pretty far down. I'm currently 36 weeks and I forget how many days; was just curious on how long after you drop it takes to go into labor