My period should come on the 8 because am 26 cycle lenght last month on the 20s I was ovulating and had unprotected sex with my husband. I get the symptom of nausea on the afternoon, fatigue and some lower abdominal pain like menstrual cramping Ive checked with clearblue pregnancy test and they come out negative. How long should I test. Doctors tell me I need to wait at least 5 weeks for it to show of 7 days after missed period