I had a coil fitted about 5months ago because i have heavy periods and im overweight. i have been fine until 2weeks ago i started feeling faint and found my blood pressure was low but im being treated for high blood pressure and im also on a diet and ive lost 1stone. now im over a week late and feel dizzy all the time. since ive had the coil this is the 1st month ive been late what could this be