What's wrong with me?!

Okay, so my boyfriend and I do NOT use protection. The past week and a half my breasts have been SOOO tender! I've been wanting to eat scrambled eggs all the time, and strawberry banana smoothies. I HATE EGGS! I keep getting nauseous, and dizzy! Our apartment is on the 3rd floor, and when I'm trying to climb the stairs I get dizzy! I've taken two pregnancy tests and they've both been negative...?