have you been taking your vitamins. i had to take so much more iron when i was pregnant otherwise i would have big dizzy spells and see spots. DH used to fret over it..hope you find out what the cause is soon. my blood pressure was perfect in my first pregnancy and i was on a high risk watch because of all the health problems of our angel baby. i remember having 3 appts a week for the last 5 weeks to monitor heartbeat etc. on the monday my bp etc was still perfect but on the wednesday i walked into the shopping centre, had gone about 30 metres from my car to seating inside and was so dizzy and short of breath that an ex work colleague who saw me sat with me for a while before i went straight back to my car and slowly home. at my checkup the next day i was immediately admitted as my bp was sky high and they said i was in early stages of pre-eclampsia. i had no swelling or any other symptoms. i was induced the following monday. so maybe just go for a checkup or ring health direct on their free call number and see what the nurse says. good luck..