Blood HCG: If you did the tests correctly at 13 days after missed period, you are unlikely to be pregnant. To be sure, you may get a blood test for HCG level. 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.
Answered 3/15/2016
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