Stress at work

We are expecting our rainbow baby in July after two miscarriages. I have finally been starting to feel a little less nervous because we made it past the 6 week point when I lost the second baby and the 10 week point when I lost the first baby. Now at 13 weeks I have still been feeling very nauseous so I have been taking that as a good thing. But now I am nervous after the stressful day at work. I am a HS/MS special education teacher and typically I don't have behavior problems. Well today I had a student have some issues that I am sure raised my blood pressure and got me a little worked up. Now I am worried something is going to go wrong because of the stress. My next appt is next week. I just hope it comes soon and we are able to find the heartbeat fast so I can be reassured that everything is ok.