hi.. weighing your risk factors u can take a chance by not going for a amniocentesis
since its 21 weeks..This procedure is used to collect amniotic fluid
, the liquid that is in the womb. A needle is inserted through the abdominal wall into the uterus
, using ultrasound
to guide the needle. Approximately one ounce of fluid is taken for testing. This fluid contains fetal cells that can be examined for chromosome tests. It takes about 2 weeks to determine if the fetus has Down syndrome or not.
Amniocentesis is usually carried out between the 14th and 18th week of pregnancy; some doctors may do them as early as the 13th week. Side effects to the mother include cramping, bleeding, infection and leaking of amniotic fluid afterwards. There is a slight increase in the risk of miscarriage: the normal rate of miscarriage at this time of pregnancy is 2 to 3%, and amniocentesis increases that risk by an additional 1/2 to 1%. so discuss with your doc and make decision