3rd Trimester Stress - What are the risks?

[Blahh95]

Work have royally screwed me over! In a team of 5 they have sent 2 people on training courses while another 2 are on holiday leaving just me to manage the workload!
Im currently 32 weeks pregnant, working in a call centre with our team averaging around 150-200 calls per day - my boss hasn't sorted any relief staff to help me at all! Customers are usually angry enough but with the added wait times they're even angrier and can feel myself getting stressed out!
Can this added stress cause any risks? If so what?
Do I need to speak to the boss and tell her straight that I need some relief staff in to help me?

Yes, speak to your boss. Also remember that your you're only one person and you can only do what you can do, an unreasonable workload is your companies problem not yours. This is poor planning from your management and will damage their business so it is in their interest to sort it out.