I am 17 years old, and I have never missed a period up till now. I am 2 weeks and 1 day late. I have taken 7 hpt and all of them have been negative. I have been nauseous for 3 days strait, I've been very fatigued, going to the bathroom a little bit more then usual, I crave cream cheese and mustard together on a goatscheese pesto sandwich, weird huh.. my nipples are turning brown/ have brown circles around them, and the smells of some foods make me sick. Can I still be pregnant? :confused: please help! Can you still have so many negative pregnant. Tests and still be pregnant??

IDK about whether or not it's possible... You may just be being paranoid, but I would go to a doctor if you get to be more than a month late. Usually people don't experience morning sickness this early on...
There can be many reasons for being late. You may not have enough body fat, you may be under a lot of stress, etc. I think the best thing to do would be to wait another couple of weeks and go to the doctor.

Trust me haha I have way more body fat then I need. And I haven't been under stress at all. Same work load, and everything, and it's the summer so no school. No family problems, no boyfriend problems . No stress at all. I don't know...

Well if you are you calculate it by the first day of your last period up to today's date.You could be 4 or 5 weeks pregnant which by then would show the symptoms of pregnancy.
I don't know if its possible or not but I do know you can get a wrong negative but very unlikely a wrong positive..