Hello, I have read ur query. Don t be Panic. 1) Emergency contraception makes it much less likely you will get pregnant. But emergency contraceptives are not as effective as birth control that s used before or during sex, like the pill or condoms. 2) It depends on the pregnancy test that you use. All pregnancy tests measure the amount of human chorionic gonadotrophin (hCG), the pregnancy hormone, in your body. Home pregnancy tests detect the presence of hCG in your urine. Some home pregnancy tests are more sensitive than others. The more sensitive tests may be able to detect low levels of hCG as early as four days before your period is due, or seven days after conception. The sensitivity of a pregnancy test is described on the packaging as mIU/ml (milli-International Unit per millilitre). Pregnancy tests range in sensitivity from 10mIU/ml to 40 mlU/ml. The lower the number, the more sensitive the test, and the earlier it can detect pregnancy. If you test too soon in pregnancy, even with a sensitive test, the amount of hCG in your urine may not be high enough to detect. Getting a false negative, when a test that says you re not pregnant and you are, can be stressful. Most home pregnancy tests will give accurate results if you test at the time your period would normally be due, about two weeks after you ovulate. A test may be negative for several reasons. You may not be pregnant. Or, you may have ovulated later than you thought, and not be as far along in pregnancy as you thought. One in 10 women can have very low levels of hCG levels at the time of a missed period. If you have a negative result, but still don’t get your period, test again three days later. If you are pregnant, the levels of hormone may build up enough by then to be picked up by the test. A blood test can also detect hCG. Blood tests are more sensitive than urine tests and can detect pregnancy from about six to eight days after ovulation. However you will not be offered a blood test for pregnancy until after your period is due, and even then only if there is a medical need. Talk to others who are hoping to get pregnant by joining our Actively trying group. I would like to tell u something. Emergency contraceptive pills prevent pregnancy primarily, or perhaps exclusively, by delaying or inhibiting ovulation. There is no evidence to suggest that either of the FDA-approved emergency contraceptive options, levonorgestrel (LNG, such as Plan B One-Step, Next Choice One Dose, Next Choice, and Levonorgestrel Tablets) or ulipristal acetate (UPA, such as ella) works after an egg is fertilized. In two recent studies1,2 of the levonorgestrel regimen, women who presented for EC were monitored to identify their menstrual cycle day and ascertain which women took EC before ovulation, and which took it after. Among women taking LNG before ovulation, there were no pregnancies. Among those who took it on the day of ovulation or after, there were about the number of pregnancies that would be expected with no use of EC; if LNG were effective at preventing implantation, it would most certainly be more effective when taken after ovulation. A 2010 study 3 of ulipristal acetate (ella) found that at certain doses, it can decrease the thickness of the endometrium (by 0.6 to 2.2 mm), but it is not clear that this would in fact prevent the implantation of a fertilized egg. Thank You .Take care. Rate 5 Star if u like my answer. DR JIGNESH VASAVA