folic acid - please help!

I am 38. I’ve just discovered that I am pregnant. I am a post in the states. Since I haven’t planed this pregnancy (although very happy about it), I havn’t taken folic acid. I know in my age I should have. What is the recommended doze ? I should mention my sister (42) had an annacephalus embryo and had to go trough abortion. Your advice is very much appreciated!

You are with low risk for NTD', So, the dose recomended 400 mcg per day. The recomendation for your sister - 500 mg per day because of her history.

,Dear Dr. Zabari thank you very much for your advice.