My Boyfriend And I Have Been Together And I Think

My boyfriend and I have been together and I think I may be pregnant. I took a test,but It said negative. However, I have friends who are or were pregnant and they took a test and it said negative for them. I believe it is likely I am pregnant. For a few weeks I've noticed things. I hardly get head aches and almost everyday for a couple weeks I have been getting bad head aches and feel dizzy and light headed. I also have been feeling nauseous a lot and I am ALWAYS hungry even if I eat a lot and it's 10 mins later I still feel like I'm starving. I have been eating odd combinations of foods my boyfriend says I usually don't eat. I also realize I work but I've been super exhausted latlwy and want to sleep more and by then end of a day I'd feel exhausted and couldn't keep my eyes open or I'd feel that way only working an hour at my fast food job. I've also noticed I have been having for few days abdominal pain and lower back pain. Finally I believe my period is at least 11 days or more passed the time I should of had my period. I have had slightly sore on and off chest which I usually have that or cramps 5 days or week in advance to say period is on its way. But I still have had no period and been feeling this way. I don't know if I am pregnant and the test was wrong or what's been going on with me. I need advice and opinions of what is going on with me. Please and thank you