Folic acid after 12 weeks....

Chelsey • Lola Iris due 27.12.16 💕
Hi ladies, after my booking app my midwife
told me because of my bmi (35) I'd have to start taking extra folic acid after 12 weeks. I'm now 13 weeks and haven't had any prescribed Ive had to ring up and ask however I've read on various sites that you should only take extra up to 12 weeks? Was the midwife wrong? Or do I need to take the extra? Is anybody on extra because of thief bmi????