Until your first trimester ultrasound, which is often performed between weeks 6 and 9 of pregnancy but can be done at any time between week 14 of pregnancy, your doctor won't be able to say for sure. If your human chorionic gonadotropin hormone (hCG) levels are greater than usual, it's possible that you could detect twin pregnancy as early as week 5.
As soon as the embryo implants in the uterus, your body starts to produce hCG. During the first few weeks of pregnancy, levels peak, and for the next 10 weeks or more, they typically double every two to three days. If you have two eggs if your doctor requests a blood test to check your hCG levels and they are really high.
Again, it's not always the case, and the first ultrasound will tell you for sure. But keep in mind that knowing so soon can occasionally be disadvantageous.
Now more than ever, doctors can detect Twin Pregnancy Symptoms, but around 20 to 30 percent of the time, vanishing twin syndrome results in the loss of one of the twins later in the first trimester. When this occurs, your body often absorbs the tissue of the miscarried twin.