Advanced maternal age. Age of the mother is more than 35 years

• Lifestyle choices. Smoking cigarettes, drinking alcohol and using illegal drugs can put a pregnancy at risk.
• Maternal health problems. High blood pressure, obesity, diabetes, epilepsy, thyroid disease, heart disorders, asthma, and infections can increase pregnancy risks.
• Pregnancy complications. Various complications that encountered during pregnancy include an unusual placenta position, fetal growth restriction and rhesus (Rh) sensitization — a potentially serious condition that can occur when your blood group is Rh negative and your baby's blood group is Rh positive.
• Multiple pregnancies. Pregnancy risks are higher for women carrying more than one fetus.
• Pregnancy history. A history of pregnancy-related hypertension disorders, such as preeclampsia

Need to consult with doctor after the occurrence of symptoms. What you can do to prevent a high-risk pregnancy, stick to the basics. For example:

• Schedule a preconception appointment. If you're thinking about becoming pregnant, consult your obstetrician. Your doctor will prescribe you to take prenatal vitamin with folic acid and advice you to reach a healthy weight before you become pregnant. If you have a medical condition, your treatment might be adjusted in preparation for pregnancy. 
• Seek regular prenatal care. Prenatal visits can help your health care provider monitor your health and your baby's health. You might be referred to a specialist in maternal-fetal medicine, genetics, or other areas.
• Avoid substance abuse. If you smoke, quit. Restrict alcohol and illegal drugs too. Talk to your doctor about any medications or supplements you're taking.

Depending on the plan, your doctor might recommend:

• Specialized or targeted ultrasound. This type of fetal ultrasound — an imaging technique that uses high-frequency sound waves to produce images of a baby in the uterus — targets a suspected problem, such as development that's not typical.
• Prenatal cell-free DNA (cfDNA) screening. During this procedure, DNA from the mother and fetus is extracted from a maternal blood sample and the fetal DNA is screened for the increased chance of specific chromosome problems.
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Invasive genetic screening. Your health care provider might recommend amniocentesis or chorionic villus sampling (CVS). During amniocentesis, a sample of the fluid that surrounds and protects a baby during pregnancy (amniotic fluid) is withdrawn from the uterus. Typically done after week 15 of pregnancy, amniocentesis can identify certain genetic conditions as well as serious problems of the brain or spinal cord (neural tube defects).

During CVS, a sample of cells is removed from the placenta. Typically done between weeks 10 and 12 of pregnancy, CVScan identify certain genetic conditions.

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• Ultrasound for cervical length. Your health care provider might use an ultrasound to measure the length of your cervix at prenatal appointments to determine if you're at risk of preterm labor.
• Lab tests. Your health care provider will test your urine for urinary tract infections and screen you for infectious diseases such as HIV and syphilis.
• Biophysical profile. This prenatal ultrasound is used to check on a baby's well-being. It might involve only an ultrasound to evaluate fetal well-being or, depending on the results of the ultrasound, also fetal heart rate monitoring (nonstress test).

What else do I need to know about high-risk pregnancy?

Talk to your doctor about how to manage any medical conditions you have during pregnancy and how your health might affect labor and delivery. Contact your doctor if you have:

• Vaginal bleeding or watery vaginal discharge
• Pain or cramping in the lower abdomen
• Decreased fetal movement
• Pain or burning with urination
• Changes in vision, including blurred vision, severe headache

• Sudden or severe swelling in the face, hands or fingers
• Fever or chills
• Vomiting or persistent nausea
• Dizziness
• Thoughts of harming yourself or your baby

A high-risk pregnancy has to be handled with care . Do your best to stay positive as you take steps to promote a healthy pregnancy.