my cycles r 30 days my period came on july 25 i had sex on the 9 of aug i hav all the sytom nausea fatigue headache but my period came on aug 25 it stayed on dark for day an bright 2 i did not bleed at night and it did not hav the smell of blood. no breast r sore nausea all day n night could i be or not.........i some people having a cycle an b pregnant