You are actually not pregnant yet. Pregnancy weeks are counted from the beginning of the last menstrual period, not from conception. Your last menstrual period before conception will start. The lining of the uterus (endometrium) is thickening, to be able to receive a fertilized egg later on.
Folic acid also pteroyl-L-glutamic acid is a water-soluble vitamin that belongs to the vitamin B group. Also called Antianaemic factor. Man can acquire folic acid mainly from vegetable sources, less from meat. The absorption of folic acid is inhibited by excess alcohol and smoking.