Re: clothing question
The other thing mybe the style you are wearing, if you are wearing the bikini style brief it will never stay up. In fact it may never stay up properly again

I never bought maternity underwear, last time I was pregnant was 17 years ago tho and I don't think they even made it

. We just went up a size (or three, I was carrying twins

) and bought the "grandma knickers" otherwise known as high waisted.
I would get at least 3 pair of comfortable knickers, maternity or otherwise, you still have a way to go and uncomfortable underwear is just going to make you miserable, and you will be able to wear it after baby's born (if they have an expandible waistline like maternity pants do). It is going to take a little while to get back into shape even if movie stars can get their figures back in 6 weeks, even after having twins. Mind you you may have a personal trainer, a private chef, a nanny or 3 and a complete houselot of maids and cleaners to help

If so, half your luck

Back to underwear, you need to be comfortable, so go and get advice from a maternity wear shop, then see if you can find the same thing a lot cheaper in a department store.
good luck Hun, you need to be comfortable.