Folic acid
This is more for spinal development. Without it, the spine may not fuse properly. So no need to take until birth. My first one i started only after 5 weeks or 6, so it's not a problem. For this one, i think i started while trying, so maybe i started 2 or 3 weeks earlier.
For intelligence, take fish oil, but don't start now. I remember it is much later in the pregnancy.
Double dosage
Yeah, cannot take double dosage. Our liver cannot take it, and some may cause problem.
Gender
I had a feeling that i might have a boy for #1, but then the scans weren't conclusive, so i was hoping for a girl. Was a little disappointed when confirmed to be boy. In the end, after i gave birth and went to geomancer, he asked me why i kept thinking my son was a girl, based on his birth characters. So now, even though i hope to have a girl, so that can have both genders, i try not to think to much in case i project wrong energy to a baby whose gender is already determined at conception. My husband would prefer a boy as he has a brother and think boys are easier to look after.
Regarding old wives tales, my stomach was really pointed and it was a boy. Nowadays, with scanning, we can tell the gender before our tummies get that big for people to guess.
Re burgers
I only take macs fillet o fish without tartar sauce. Easiest to buy in the morning coz other stalls that are opened in my area only sell fried beehoon and other fried stuff which is a big nono for me at the moment.
Anna: i think feeling after a meal comes as the gastric juices are produced to digest the food, but our stomachs over produce them to the extent that we feel nauseaus.