Unprotected sex day after period ends. Neg test result day after period supposed to being. Neg result 1 week after missed period. Why late? Pregnant?

Time and technique. If you did the test correctly at one week after missed period and it was negative, you are unlikely to be pregnant. You may wish to repeat the test in 4-5 days, use first morning urine and follow the instructions for the test carefully. Menstrual irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. If you do not wish to be pregnant, use contraception all the time. You may consider implanted contraceptive or an IUD. Consult this site for more information on this topic. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/Pages/causes.aspx Practice safe sex. Get HPV vaccine.