My last cycle was 31 days, and my period came up on the 2nd of october.I observed cervical mucus and noticed the egg white on the 15th and 16th. On d 20th it was white and lumpy and I slept with my partner that evening, took postinor 2 abt 25 hrs afterwards and the second dose as directed. I started having cramps on the d 22nd at the pelvic region almost like premenstrual cramps. Then 28th I noticed brown spotting. I have been having back pains more on d lower side. No sore or tender breasts like previous premenstrual syndrome. Could I be reacting to the pill or I might be pregnant or I might be coming down with something else? I took a pregnancy test, I know it's early, and it's negative. Thanks.