The overall risk of getting a stroke from a migraine is extremely low , but if you have migraine with aura, you are about twice as likely to have an ischaemic stroke in your lifetime compared to those without migraine. However, the risk is low and it is far more likely to experience a stroke from other risk  factors like smoking and high blood pressure. If you have other reasons to believe you are pre-disposed to stroke i.e. if you are taking the contraceptive pill, you should speak to your doctor and make sure they are aware of these symptoms and any relevant medication you are taking.