Hi,
Unfortunately stress is not the only cause of missed menstruation cycles though it is a common one. In some women the pregnancy hormone is low and slightly harder to detect so i is possible that you are pregnant. I would strongly recommend waiting at least another week and taking another test, make sure you do it first thing in the morning as the hormone is heavier at this time in your urine. If you are using a digital test I would suggest a regular blue strip test as they are more accurate and the digitals have a record of giving false negatives and false positives.
If you still get negative results and you miss your next cycle you need to speak with you doctor or OBGYN to determine the cause.
Walter
PS: If you have recently started a birth control method such as the pill or the shot or other medications these can interfere with your cycle.
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