I get these migraines (acephalytic migraine: migraine with no headache). But not when pregnant - only every other time in my life! I've been checked for stroke, MS, Hughes' Syndrome and a few other rare things. Scariest was when I couldn't move for about 2 hours and Liebling had to look after both of us when he was just 2 years old. Actually, scariest was have it happen during a GP appointment and seeing her face when I couldn't talk or walk properly. It really can freak you out, especially with no known cause.

If you fully recover then it is unlikely to be a stroke. Eating little and often is good advice, especially when pregnant. Low blood sugar can cause this, but if you can get some more tests then do so.