I had sex one time which was at the beginning of my 2ND week at the end of my 3RD week i forgot to take two of my birth control pills, when i remembered to take them it had already been two days. i took all three pills the day i realized. Now i'm on my fourth week - my period pills and i'm four days into them i have not yet started my period nor do i feel like i'm going to I took a pregnancy test yesterday said negative but i think it might be to soon to tell? Is there a chance i'm pregnant or just messed up everything not taking those pills?