I've been getting them quite alot too, but I've now got low blood pressure so I'm wondering if that's why....
If you start to have visual disturbance ( flashing lights, dots ) and/or swelling, you need to pop and see your midwife to rule out pre-eclampsia. But saying that, it is really common what with all your hormones and the extra blood pumping around.
I also find if we're due thunder, I'm gauranteed to get a headache.... I can normally tell you that we're gonna have a storm
