hi fiona,
let me start with some good news as you are pregnant stating "fractures unite faster in pregnant women".
please click on the link below to go through a recent (2008) medical report on accelerated fracture union in third trimester of pregnancy;
Accelerated tibial fracture union in the third trimester of pregnancy: a case report
well if you are a non-medical personnel, please read the conclusion alone as the rest may be quite technical - medical jargon.
regarding normal elbow range of motion - flexion:150, extension:0, forearm pronation:80 and supination:80 degrees. from your post, I understand you do have some limitation.
I know you are curious to know the bad news. well, the negative side is that you have been to the physio only once; recovery of elbow movements is a collective effort between the physio and the patient.
dont worry about what others say, beware stress can increase your cortisol level which is not a good idea at this phase. hence be positive and work hard (home exercise regimen) as well as other mobilization measures along with your physio.
all the best. let us know about your baby too.
cheers,
thomas