okay i had unprotective sex on the 2nd and i started to ovulating on the 4th then i had unprotective sex on the 10(but i dont think he got off tho). well i have been feeling weird and eating a lot. my boobs was hurting and i was sleepy allll the damn time. my stomach felt weird, and i have been getting headachs(i usually dont get them). My balance has been wayyyy off. I have been having mood swings, so i took at test 6 days b4 my missed period and it said i wasnt pregnant, but it also said that 4 days before your missed period was only 51% correct. well then on the 18 i was suppose to start and i didnt. i didnt start until today on the 25th...so i was 7 days late. my stomach is cramping soooo bad.. i have never had cramps when i was on my period but my stomach is killing me, and i am going reallly light and it is a light color.. so is it just because i changed my cycle or what???