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Welcome to Just Answer and thanks for your question. What tests has your doctor run so far?
Thanks for the additional information which is quite important. Either a change in your blood glucose level or your thyroid level can cause the jittery butterfly feeling. So can simple anxiety. The first step would be to have blood tests to make sure your endocrine problems are being adequately addressed.
The only way to tell if you are pregnant would be to take a pregnancy test at least a week after a missed period, and use the first urine of the morning which would have the highest concentration of pregnancy hormone. Earlier than that can cause false positives. It can just be nerves/anxiety and wishful thinking. Butterflies isn't a symptom of pregnancy. The first symptom to look for is missing your period.