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Your symptoms may be related to tumour itself like nausea and tiredness.
It is better to consult your neurologist
Do not get CT scan done till pregnancy tests are negative.
I would like to know whether you are on medicine like cabergoline and your thyroid hormone status.
Get an ultrasound done within 15 days to see any gestational sac
Nausea and constipation
can be an associated features of gastric peptic disorder
Do not take any medicine without proper diagnosis.