Could Sore Breasts And Tiredness Be Pregnancy Symptoms?

Hi. Im 25. My periods are 5 1/2 weeks apart. But im now 2 weeks late. We make love then use a condom at the end. I want 2 sleep all day. And i feel queasy as well. Im eating foods i didn't like before. My breasts are sore. I have been more emotional. There has been no bleeding at all. I need to wee ALOT more and i have had some dizzy spells. I feel alittle bloated and crampy. I did a pregnancy test a week ago but it was negative. Do u think im pregnant? Could i be? What could it be?