well, i would say that, in general, i love attachment parenting resources. they have a lot of parenting tools that are really great and, IMO, make parenting super easy. LOL
there are many veg*n pregnancy/nutrition books available, and so it's a good idea to check a few out of the library and have a read through. adapting yourself to a pregnancy diet for conception is actually a good idea. you just keep your calories lower than while pregnant (eg, if you eat 2000 cals/day then just change the nutrient spectrum within that caloric amount. once pregnant, you just add 1/10th of the calories to your diet or an extra 200 calories per day. most people over eat.
i don't take vitamins, so i didn't bother, but a lot of people prefer to take them. you can take them prior to getting pregnant--find a good vegetarian prenatal vitamin.
my family isnt' at issue at all. they saw me healthy as a vegan (until the very end, when things got a bit weird), then as a vegetarian. they know i'm the healthiest person in the family. DS is super tall and skinny, but also super smart and active (as in, off the charts). he eats like a grown man (seriously, it's freaky). so, they wouldn't question it. in fact, they usually feed him vegetarian food because they know he will eat it. he won't always eat meat. i don't mind if he does (so long as i'm sure of the origins), but he so rarely does that it's no big deal.
as far as attachment parenting goes, my parents thought the methods were a bit strange, and so did my ILs, but it turned out ok. they see he's a happy kid and that we are safe and healthy. in fact, the methods that they thought were the craziest are now their favorites to share with new moms: baby wearing (no stroller, baby tied to your body--it's awesome and easy and comfortable), elimination communication (diaper free baby--we used cloth for back up, but have taken him to the potty since he was 1 wk old. it's great!) tend to be their favorites. we also cosleep (no getting up at night to get a baby out of another room), breastfeed exclusively, did baby-lead weaning. all of these techniques made parenting so easy as compared to many of my friends. when people ask why i'm doing something, i tell them it's because i'm too lazy to do it the mainstream way.
eg, mainstream breast plus bottle feeding--not at all juduging, just pointing out that--it requires bottles, a nice breast pump, cleaning the bottles, and proper sterilization before use of bottles. that's a lot of things to clean and sterilize.
eg. diapering--disposables of course we know, but cloth diapers require cleaning--in that first week, DS went through about 20-30 cloth diapers (tons of little pees). i was washing a load of diapers every day. once we started ECing, he would pee and poop in the toilet. pooping in the toilet is the best. i haven't changed a poopy diaper in *months* at this point, we so rarely have a miss. as an infant, i never did (he gave obvious signals). once he started moving, it was tougher. LOL but anyway, i only had to wash one diaper a day, sometimes as many as four. today, he's in training pants (he's 21 months), and i wash one to two per day due to "misses." from 20 to 2--lots less clean up. LOL
eg baby lead weaning--no purees, etc, no making baby food, etc. baby food is lots of jars or lots of prep plus freezing. with BLW, the baby naturally grabs food of interest and starts chomping away. no planning food introductions, very little mess honestly, and a baby who eats what you eat. no special meals, no special clean up. seriously, amazing. kid eats *anything*. no extra expenses of baby food either.
honestly, it's just lazy parenting. LOL