Your baby has probably dropped, but that doesn't necessarily mean your cervix has had any changes yet. I've had a different doctor for each of my three pregnancies and they've all been different. My first started checking my cervix around 35 weeks, my second never checked, and I'm only 30.5 weeks into my third, so that hasn't come up yet. But, while it's nice to know if your cervix is thinning or dilating, it really doesn't matter and it's not the greatest indication of when labor will start. Cervical checks are, in my experience, quite uncomfortable and plenty of women have been dilated to 3 or 4cm for weeks before they actually go into labor. So don't worry that your doctor didn't check this week.As far as the ultrasound goes, there are multiple reasons to get one late in pregnancy. As the other ladies have mentioned, the most common reasons are to check your fluid levels and to check the baby's position. Both are routine and again, there's nothing to worry about. If your doctor had some sort of concern he or she would have mentioned it to you.