I recently messed up taking my contraceptive pills. around that time i had unprotected sex with my partner. The day that i was meant to start my period i started spotting brown. i never had any blood and the spotting lasted about 4 days. Since i have started my periods i have never had a period without blood because i went on the pill to regulate them. I know have no brown and still havent had any blood 2 weeks on. i have done a pregnancy test but it has come back negative. i fell different within myself and the only 2 things that stick out is that i need the loo more and my breasts are changing. Can any1 shed any light on what might be happening?