Clinical suspicion guides labs and imaging
CT ± Lumbar puncture if increased ICP or infection suspected
MRI preferred to CT (though radiation scatter minimal)
Avoid gadolinium
Avoid gadolinium
Headache during pregnancy
Consider usual differential for headaches
Cardiac arrest in pregnancy
Also consider preeclampsia/eclampsia 
Abdominal pain in pregnancy
New onset of severe headache in no history of migraines → maintain high suspicion of[1]:
Vaginal bleeding in pregnancy 
ICH