I never noticed a drop either (well I thought I did but I think I was imagining it ) My son didn't engage AT ALL though so that could have been why.

Babies can move in and out of being engaged as you get closer to term. I wouldn't stress about it hun. Its a good sign (given my experience) that your baby is head down and able to engage. I think the timing is one of those "variations" between women/pregnancies. Your bub could stay engaged for the next 6 weeks or more without a problem.

Are you more uncomfortable down low??