help please

Hi, I'm currently two days away from AF and I really pray it doesn't show up. For the past two weeks I've been have twinges in my abdominal area along with some slight stomach cramps from time to time, I pee a little more often and my right nipple is super sore. Sometimes when I wake up it feels like my stomach is a little tight    & today I felt a little twinge in my uterus, could this be any sign of pregnancy? Help please & also I've been using preseed and taking prenatal vitamins