If your period is delayed for 7-10 days, you can usually detect pregnancy with a test strip. Normally, 14 days before the next period is the ovulation period, ovulation will have intercourse will appear fertilized egg, if the fertilized egg can be normal implantation, will in the implantation of a day after the body will begin to release human chorionic gonadotropin, and this process takes about 7 days. If you notice that your period is delayed for 7-10 days, you can use a pregnancy test to find out if you are pregnant. However, in a few cases, some women have irregular menstrual cycles that are either early or delayed, in which case ovulation cannot be determined and it may not be possible to detect pregnancy after a few days of delayed menstruation. If your period is delayed, you can go to the hospital for a blood HCG test or a combined ultrasound, which will confirm pregnancy.