What Causes Sore Breasts, Constipation And Dizziness While HPT Is Negative?

believe i am having pregnancy symptoms although the test i took today come back negative. I never get sore breasts and this week it is a relief to take my bra off, i have been consitpated, falling asleep by 9pm back ache, dizzy and light headed, all of which is unusual for me. I also have an IUD and my boyfriend has had a vasectomy but never went back to make sure he was firing blanks