i brought ovulation kits which said i was ovualting on 20th 21th, i had sex 19th and 21th 23th

i brought ovulation kits which said i was ovualting on 20th 21th, i had sex 19th and 21th 23th, i got my period on the 9/9/12 and not due til 9/10/12!! i normally have sore breast for roughly 2 weeks b4 hand but this morning there was dark brown blood, very confused as this hasnt happened before, been ttc for bout a year now!!!! need answes