About 27 weeks is considered 3rd trimester yes
Well done on making it to the final haul!
(Got the info from a good site which shows the final bits to do! Here's ya checklist below - I'm looking at my second trimester one - there's a few bits I've forgotten to do already!)
Join antenatal/parentcraft classes
Understand labour & Birth
Book your TENS machine if you're gettiing one
Decide the type of birth
Decide where to have the baby, if you haven't decided
Complete your birth plan
Buy nursing bras
Make another appointment with your dentist
Gear up for the big day & pack your bags
Discover your and your baby's progress each week
Be able to deal with discomforts
Register your baby-to-be with childcare if you haven't yet. Time runs out fast!