I'm really scared and have questions!

I am 6 days late for my period. I'm 19. The last time I had sex was November 11th and I'm not going to lie, my boyfriend and I have a lot of sex but it's always protected and we are very careful. I had some brown spotting earlier this month so I put in a tampon but after that there wasn't anything. I had very little brown spotting a few days ago but it was very slight. I've had lower back aches and the other night I for sure thought I had cramps but I still didn't get my period. My breasts are sore now and then but otherwise I keep feeling like I should get my period. I have taken three hpts and all of them have been negative, I even took one first thing in the morning like people say you should. I'm really freaking out about this because I have never been this late before. I'm a college freshman and I do have a lot of stress lately with finals coming up. Also, my diet is horrible and has changed a lot since I'm gotten to college. Could I really be pregnant? I'm incredibly scared.

[KailynJohnson]

So your period was due 2 days after you had sex? Did you have sex any other days? Because its unlikely you got pregnant two days before your expected period. Though, you may want to go get a blood test.