I'm about to come to the end of a pot of folic acid I've been taking. I'm 19 weeks on Saturday. Is there any benefit in keeping on taking them or should I not bother. There's folic acid in most prenatal vitamins I belive which are taken until birth so should I just carry on? (MW adivsed me to stop taking the vits a few weeks ago when my blood tests revealed that my iron stores are very high and I don't need any extra!)