Feeling Dizzy, Nausea, Lower Abdomen pain, late period

Ok, so i'm almost 17, me and my boyfriend have been together over a year. We're not tryin to get pregnant. I've been on bc for like 6 months, maybe more. I had a period on Oct. 2, it only lasted 3 days, heavy first day, really light other 2. Then i had what i thought was another one on Oct. 14th-20th. was like pinkish color most time, then turned bright red for a day or two. then went pink again. i quit taking my birth control cuz' i thought i could be pregnant, right after i quit on 20th. i was supposed to start again around Nov. 2, i didn't. so i thought ok maybe i will start around 14th...NOPE. Still nothing. and it's Nov. 19. I have took about 4 tests since Oct. 5 and 2 didnt work, and 3 said negative. (including one i took this morning) I dont know what else to do. I have somewhat like cramps in my lower stomach, like im going to start (past 5 days) and havent. i am hungry all the time (not normal)- used to go without breakfast and most of the time skip lunch..now i'm like starving all the time. I have to pee like constantly. its crazy. i get dizzy sometimes, sometimes i'm nautious. every once in a while i get headaches...Can someone help? Are those signs of pregnancy?
Could i be pregnant, even though the tests say negative?