i am 18 years old. I have not had my period in 3 months. My last period was Nov 16, 2011. i took pregnancy test all came back negative. I went to a pregnancy center and it was still negative. She told me that if i am pregnant that i would be 14 weeks. I have tingling breast, eat all the time, weight gain, headachs, morning sickness, dizziness, etc. Why isnt it showing up in the urine test? Could i have something else going on in my body ?