###Human: When exactly does the pregnancy symptoms arise after unprotected sex? ###Assistant: Hello. These are not pregnancy symptoms, but rather they are symptoms of ovulation with mild abdominal ache, nausea, headache, bloating and thin mucus discharge from vagina. As her last menstrual period (LMP) was in the last week, two months back. So, it is day16 today. Hence in a 30 day cycle, this is the time for ovulation. As you had sex in the first week the following month, still she can be considered in her fertile period and hence an emergency contraceptive is advisable to be taken in 72 hours in your case to prevent pregnancy. However, the earliest you can detect pregnancy would be after 7 days post-intercourse with a serum beta-hCG test. If it shows the level of hCG more than 5 ng/dL then shall confirm pregnancy. Otherwise, she would be pregnancy safe. But, at present these are ovulation signs. Revert back after the test to an obstetrician and gynaecologist online -->