Sore Breasts And Nipples, Tired, Vomiting. Can This Be Pregnancy?

My breast are sore the area around my nipple is way darker then the rest of the breast. I have to use the bathroom every 30 mins. Really tired, and here and there i feel like im going too throw up but never do...I took a test but i think i may have taken it too early too get the right answer...I was pregnant before and i never got the right answer for a home test. I was almost 3months when i went too the doctor but the home test kept saying i wasn t