hi doctor, i had an unprotected sex on 23 october; my boyfriend ensured me that he did not ejaculate Inside me, but I myself was just feeling like no,.... he s lying to me; I took postinor 2 the following day; after 4days as usual i started bleeding, but this time it went upto 7days of bleeding and I was suppose to have my normal period on the 8th of november.....nothing until now. i did the pregnancy test it was negative, but i m having lower back pain as if i wanna see my period, what am I really having?