I am 20week pregnant its my first pregnancy i am...

Dear Customer
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is the sign of white bright mark on heart is a down syndrome sign ?

as you doctor said , its not a cause of concern , and its also not a sign of down syndrome anomoly 

Medical investigation for Down syndrome in pregnancy period?

- Screening  down syndrome during pregnancy stage is done by some tests which could give a primary diagnosis but not 100% accurate , as example :
1. ultrasound test ( after 16 weeks of pregnancy )
2. quad screen ( after 16 weeks of pregnancy )
3. fetal DNA test ( after 10 weeks ) (most sensitive but expensive and not widely available)
 

General advices :

1. in pregnancy , pregnant woman need more protein and calcium than normal woman which could be gain in dairy products and meat
2. stick to healthy diet enriched by green vegetables and fruits
3. avoid stress physically and mentally because it effects your baby as well
4. visit your personal doctor routinely and follow their advices
5. avoid bad habits like smoking and drinking and replace it by healthy habits like exercises
6. ask your doctor about the medicine you take or you will take and check if it affect your pregnancy and your baby health , and keep yourself checked in case of taking medicine during pregnancy

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Kind Regards