To begin with, welcome aboard!!!
Here are some abbreviations, but I am sure that others will be able to add on....
EFM - Electronic fetal monitoring
IA - intermittent auscultation (Doppler)
NST - Nonstress test
NC - nuchal cord (this is informal, so may not see it)
FHR - fetal heart rate
vtx - vertex
VE - vacuum extraction; also may see it called VAVD - vacuum assisted vaginal delivery
LGA - large for gestational age
SGA - small for gestational age
AGA - appropriate for gestational age
UC - uterine contractions; have also seen them informally abbreviated as ctx
BTL - bilateral tubal ligation
....this is just a start, but hope it helps. Best of luck in your new job.