working while pregnant with identical twins

Is there anyone who can give me insight on working while pregnant with twins. I was told that I am already high risk because the babies share one placenta different sacs. At my job I am never ever sitting down for more then 30 minutes at a time. I am constantly lifting around 10 lbs through out the day and running around the office/seeing patients. We are also down two staff memebers so it is extra crazy. My legs and back have been achey at night (I'm only 14 weeks along) but my co-workers and boss are treating this like a normal pregnancy. Am I being dramatic and lazy? I just don't won't to over do it and it seems like no one else cares. Anyone else have any insight???!!