Morning!!
Shannen, don't worry too much. I think you may be only in week 6+. not week 7+. Cos my LMP is 1 June, and I'm only week 7+ now. If you ovulated late, or if you conceived late (sperm meets egg late), your fetus may be smaller than expected too.
On topic of "an tai", what's important is for us to eat carefully and have a well balanced diet. folic acid tablets are the only essential supplement now. The rest, is given only if doctor thinks it is necessary.
folic acid best is to take in 1st trimester. no need to really take before pregnancy, UNLESS you detect pregnancy really late. if you are constantly checking for pregnancy, it's okay to take it once you realise you are pregnant.
1727, don't worry about not taking folic acid only now. I also started only recently. About 5 weeks +, but it shl dbe okay. Same experience with my #1.