My OTR microwave instructions were 30 min clearance between the bottom of the cabinet and the top of the cooktop. I have 32 total, so my microwave is about 16 over the gas cooktop. It passed the code inspections at that height.
There are some ways to get baby's attention, but if fetal movement isn't felt enough, call the doctor. The gentle rocking of mom's everyday movement most often lulls the baby to sleep, hence baby sleeps all day and wakes up when things get calm at night. To alert baby, simply lie down for an hour or two and chances are she'll wake up and move around. While you are reclining, change your position occasionally, between lying on your back to lying on your side, for example.
If you haven't been exercising during your pregnancy, start slowly. Walk for 10 minutes a day, and gradually increase to 20 or 30 minutes. Using a birthing ball in the last weeks of pregnancy will encourage your baby to settle into the pelvis while also relieving pressure and increasing blood flow to the baby.