Sorry to hear your m/s hit you to the point you couldn't take tablets. Hope you're feeling better now.

From what I understand, the crucial time for folate is in the first trimester when everything forms and develops.

If you were too sick to keep taking it, try not to worry too much. I always think of our generation, when we were born, no-one was taking folate supplements or avoided various foods etc. Majority of us turned out ok!

I don't know how crucial they say it is after the first trimester tho. It's a good question.