I know it's easier said than done but try not to stress and don't wish the time away too quickly!! Once you get your head around it all being pg can be a lot of fun and a very special time. It goes fast enough as it is believe me, it seems like only yesterday I was also 4 weeks and feeling scared. The further along you get the less you worry (at least that has been my experience). I agree about trying to avoid the m/s but again, don't stress too much about this either as you might not get it or it might not be too evil/unmanagable. Good luck! Sending your way!