My doctor prescribed folic acid with vitamine b and iodine for all pregnancy. is the duration ok or it's too long?

Prenatal nutrition: Folate deficiency can cause neural tube defects and folic acid supplementation can prevent them. The ACOG does not currently endorse the prenatal-supplement recommendation of iodine, advising instead that women get their iodine through dietary sources. If having a well-balanced diet, vitamin B routine supplementation is not recommended.