I have usually had very low BP usually running 96/60 or there abouts. For the past two weeks it has been running 183/103 and a little lower. I had started getting nauseous about one week prior and have not had a period in almost two months. I have taken three home pregnancy tests all coming out negative. What could be wrong here? As a side not my mothers pregnancy test did not show positive until she was four months pregnant with me. Could this be a hereditary thing or something totally different ? Thank you for taking the time to read my question.