MOST definitely. There is even a psychological disorder in which your body will actually produce a false pregnancy -- ie. the hormone released in urine, the tender breasts, even the growing belly. If you stress about having symptoms of a pregnancy, odds are your brain will be alert for any and all symptoms that might confirm it. Therefore making you think you are pregnant.
Could be pregnancy or stress. take a test
The power of suggestion is very powerful. Many of the symptoms of pregnancy are also associated with stress and sleep deprivation. Basically, if you're looking for it, you will find it, regardless of if it is really there or not.
You are correct that stress can cause disruptions in her cycle. The symptoms that you describe are the same as is seen in pregnancy, but they are also side effects of the morning after pill. I think your best course is to get a pregnancy test and put your mind at ease.
stress during pregnancy can lead to tempromandibular disorder
it causes symptoms with the brain
They were symptoms of my pregnancy, but just because you're experiencing these symptoms does not mean that you are pregnant. They can also be symptoms of being overly stressed which can also affect your period. Well heartburn is definatley a symptom of pregnancy. As you do not get heartburn from stress! Actually all those symptoms are a symptom of pregnancy.