Ok. I had sex on Sunday, May 16. But I took the Contraception Pill the next day on Monday, May 17. But ever since about a day after, I've been soo tired and snappy. My stomach is terribly rough, And I feel pregnant. But I took a pregnancy test today on Tuesday, May 25, And it was negative. My stomach still feels terribly rough, And I get nauseous at times. I cant tell if im pregnant or not..?