Am I imagining this, or am I really pregnant?

Ok, first off I take the pill, but I miss pills a lot when I'm with my boyfriend and we have unprotected sex. I am wondering if I'm pregnant because on the night of May 5th I started cramping really bad, and my period wasn't for almost a month, so I was really confused. I started getting the chills/hot spells, nauseous, and couldn't sleep, but when I did fall asleep, I had nightmares. I thought maybe I was nervous because I had a Spanish final the next day, and I always get nervous around test time, so I didn't really think anything of it. The cramping persisted, so I knew it had nothing to do with stress, or being nervous. Then, about a week later we had unprotected sex, and he noticed a little blood was on his penis. I was embarassed, but worried at the same time. I knew it wasn't my period because I had just taken the pill the day before, and I never bleed the day after. It always takes 3 days before I have my period when I miss pills. The blood started to get a little heavier on the 3rd day, but not enough for a tampon, or a pad. The bleeding finally stopped on the 5th day, but I still kept cramping and feeling really nauseous. Then a few days later, my lower back started hurting. It's hurt for about 4 days now. I also have some type of pulling feeling in my stomach. My boobs hurt to the touch, and I have been having a lot of headaches, and extreme mood swings, and getting tired a lot earlier than usual. I also have started eating more, and feeling like I'm running a fever, or have a cold. I have taken 2 tests, but they were both negative. My period isn't for another 10 days, since I am taking the "every 3 month pill." I have taken birth control since I was 16, and I just switched to a new type of pill called Jolessa in December. I don't know what's going on, but nothing hurt or felt different until May 5th, which was 5 months later from starting the new pill. Am I pregnant, or am I just imagining things and so my body is going crazy?