Pregnant or not ?

Sarah
Im 2 days late (regular CM) and i dont have any premenstrual symptome like i used to have (hard pains) . My breast hurts just a little and only inferior abdominal cramps(not everytime, just a little) . I did a test today, but its negative . What should i do ? Can i be pregnant and its to small for test or i have something else?! 
I had sexual activity with my boyfriend(with ejaculation because we want a baby) . Sorry for my english! :)