pregnant???

I'm 19 yrs old. my period was due the 6th of january.i have excessive discharge, its white doesn't smell . i have to go to the bathroom a lot.i've also had very poor criculation as times as well.i feel sick wen i lay on my stomach and smell certain foods or smells i feel dizzy and tired at times. i'm getting bad acne and i'm very moody.my gums are also bleeding when i brush and i brush everyday. a couple of days ago i felt like i was going puke and the feeling stayed all day and night, the next day it wasn't there i've taken four home test they all say negative. im not stressed or exercising or gain or losing weight. ive stopped drinking and smoking since i didnt get my period. ive been having unprotected sex, we used the pull out method but 1 time he came half inside me around the 20th of december, i had my last period the 6th of december.my periods are always on time. im very worried wat the possiblity of me being preg even with the test comin up negative? wat can i do to comfirm or deny being preg??? i want to find out so i can start getting prenatal care please help me