The first thing you need to do is to rule out whether you are pregnant or not if you have sex without contraception for 16 days after your period has been delayed. The easiest and fastest way is to go to the drugstore to buy early pregnancy test paper, with their own morning urine test, if the display of two bars is positive on behalf of pregnancy. If your period is usually regular, once a month, and your period is delayed for 16 days, go to the hospital to do ultrasound to determine the pregnancy can see the gestational sac. Look at the location of the gestational sac is not ectopic pregnancy, if ectopic pregnancy can not continue the pregnancy, if the gestational sac in the uterus develops normally, there is fetal heart tube pulsation, is intrauterine pregnancy normal. In this case, the pregnancy can continue, as long as the follow-up good labor and delivery, a comprehensive physical examination can be.