:agree: yep I 110% want you guys on multivitamins, Vit. D (total of 1000) and probiotic as far in advance as possible)
DHA/Omegas I am less sure about although I believe them to be probably ok (and I took for like 2 years straight before I got my 4th boy!)
Other things like green tea, herbs, BSD if doing that - those, wait till right before your sway to start. also do not up sodium or cut out cal mag any sooner than 6 weeks before.