CONGRATS on your twins! every woman grows differently. there are "by the book" stats that say what is and is not perfectly average. what you will likely find is that you may be small now but in a few months you will "pop out" like many moms do. You will also find that it will depend on how the babies are laying. If they are on top of each other your uterus will be long and tall. if they are laying side by side youll stick WAY out... depends on their position. twins are miraculous to watch grow. You are fine. The babies will get what they need from you. it is most important you get what you need. try not to worry about weight gain so much. just do your best to eat healthy and nourish yourself in every way you can. The mornign sickness should subside shortly, If it doesnt and youd like some hints you can check out my website www.palmbeachdoula.com. go to be informed, then scroll to the bottom, click on pregnancy related links and in there is info on am sickness.
Since you are pregnant with twins, I wondered if you dont mine me asking, as you get further along, if you are interested, I am looking for a mother who would be willing to let me do a belly cast on a twin belly ( as close to full term as possibly ) belly castings are plaster keepsake molds of your pregnant belly. you can see one in the slideshow here .. http://www.palmbeachdoula.com/slide/whw.htm
... I want to have one that I can put up in my office that I am going to open in a few months to advertise the difference between a singleton and twin belly. If your interested let me know :) I will do it for free if you are willing to donate it to the office :)
If you have any questions, please dont hesitate to ask. R. Kraft CD CLD HBCE FCCE (doula , childbirth educator and photographer)