Consider usual differential for<unk> s
Also consider preeclampsia/eclampsia (especially if >20 weeks gestation)
New onset of severe<unk>  in no history of migraines → maintain high suspicion of:
ICH
Temporal arteritis
Vertebral and carotid artery dissection
Cerebral venous thrombosis
Cavernous sinus thrombosis
Meningitis
Posterior reversible encephalopathy syndrome
Pituitary apoplexy (Sheehan syndrome)
ICH
Temporal arteritis
Vertebral and carotid artery dissection
Cerebral venous thrombosis
Cavernous sinus thrombosis
Meningitis
Posterior reversible encephalopathy syndrome
Pituitary apoplexy (Sheehan syndrome)
Cavernous sinus thrombosis
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