Am i pregnant or not? i need to know da truth!!?

i havent start my period for a month n almost 2 weeks. so im like a month n alsmot 2 weeks late on my period, so i waswondering, am i pregnant? i did take a preg test,but it say negative.i took the test when i was a month late n some days. so, should i give another week or some days, then retake the preg test again? n see wat is the results. my signs of right now is like tired almost everyday when i get home from school, but idontget morning sickness. i dont feel tat. i do feel alittle moody somedays...n i thought it would be signs of pmsing only, but nooo i haventbeen on my period for a month n almost 2 months. mylower back has been hurting alotthough. ido sometimees crave for things like sweet onion teriyaki chicken sandwich at subway, and sometimes panda and ice cream too.mostly strawberry or chocolate ice cream. hmm, so wat? am i preg? n wait forsome days n retake a preg test again? or no im not preg? idk wat to do orthink? so please answer me wat u think!! thanks so much....and if u have advices for me or questions to answer then ill respond u back forsure okie. i really need toknow thetruth. thanks again.