Should I continue taking folic acid (5mg) after my first trimester?

Should I continue taking folic acid (5mg) after my first trimester? Some of my friends continued taking till they gave birth. But gynaecologist say can stop and just take multi vitamins. I have always had the runs / feel nauseous when I took that multivitamin hence I’ve stopped that including the folic acid for a month. worried that the baby is now lacking of folic acid