Apparently there are few signs of high blood pressure but some of the symptoms are
*Chest pain
*Dizziness
*Headaches
*Shortness of breath
*Blurred vision
My Dad has High blood pressure and has it monitored closely by his doctor (he also has Angina-a heart condition so its very important to monitor)
But best way to check is to have your blood pressure taken. As it can affect some pregnant women differently.
Hope this helps