My fiance and I are currently in school and really can't have children right now; but recently I've been a little panicky. My last period was July 3rd. The last couple weeks I've experienced a little stomach cramping; it's moved south within the last couple days. My vagina feels tighter (we just had sex and it felt as if I kept trying to push him out). I'm breaking out all over my chin (which is uncharacteristic of my periods [I maybe get 1 or 2 pimples every period]). My pulse also seems oddly high (it likes to stay in the 100-104 bpm range). My boob aren't sore, but I read that not every pregnancy has that as a symptom. I took a home test Monday morning, and it came out negative. Is it possible that the test was taken too early for my body?