As a rule, in case of a molar pregnancy a woman experiences all the signs and symptoms of a normal pregnancy: a missed period, fatigue, increased urination, morning sickness, breast tenderness, etc. generally, symptoms of a molar pregnancy may be divided into those, a woman can determine herself, and those, which may be revealed in the doctor’s office during the examination. Thus, to the signs of a molar pregnancy, which a woman can determine herself, may be referred the following symptoms:
Grapelike tissue or vaginal discharge. This symptom is considered to be the most characteristic one of a molar pregnancy. 
Either light or even heavy vaginal bleeding. Although it is possible to have light vaginal bleeding during the first trimester even in case of a normal pregnancy, still it may also be a sign of a molar pregnancy or a miscarriage.
An abnormally large uterus for the pregnancy term. While this, an excessive growth of the uterus occurs in about half of cases, and smaller – than – expected growth occurs in about one third of all cases of molar pregnancies. However, there are other possible reasons for a large uterus, except a molar pregnancy, such as pregnancy with multiples, or not being aware of how long a woman has been pregnant. Still, usually in case of an abnormally large uterus, a molar pregnancy may be suspected. 
Severe nausea and vomiting. Occasionally these symptoms may occur in case of a molar pregnancy. These feelings may be so severe, than in 10% of cases a woman gets hospitalized.
Some symptoms of hyperthyroidism, including weight loss, increased heart rate, fatigue, not being able to tolerate heat, extreme sweating, irritability, trembling hands, loose stools, weakness in the muscles, feeling of fear and anxiety, as well as thyroid enlargement may also be signals of having a molar pregnancy.

The following symptoms of a molar pregnancy are possible to get determined in the doctor’s office during the examination:
High blood pressure, which is considered to be a sign of preeclampsia, such as high blood pressure; swelling in feet, legs, ankles; proteinuria. It is not unusual that a molar pregnancy becomes the reason of preeclampsia, which develops during the first or early second trimester of pregnancy.
Absence of a heartbeat of a fetus. Because there is no fetus present in the uterus, in case of a complete molar pregnancy and in some cases of a partial molar pregnancy, it is not possible to determine the heart beat of a fetus.

Nowadays complete molar pregnancies are diagnosed during the early terms or pregnancy, that is why women, who have complete molar pregnancies do not often have this condition long enough to have such symptoms as severe nausea and vomiting, preeclampsia, excessive size of the uterus and hyperthyroidism developed.