I too have become more stressed out, angry and strict since my pregnancy, my mates all think its hilarious as I am normally extremely laid back!
The risk that comes with stress and anger in general is that your blood pressure tends to rise, along with your heart rate which is no good for bub. I also like Blessing find breathing exercises help.
So all mummies to be, try and keep it cool and calm. I have actually stopped driving since I have discoverd a new tendancy towards severe road rage!!
hope this helps
Debs