Hi gurnz u r just gonna love the 12 week scan as that little blob u may have seen earlier if u had a previous u/s is now a fully formed baby on the screen. u can see fingers and toes, legs kicking....so amazing. u get pics and u should find out if u can get a video, before u go - cause my biggest regret is not getting one for that (i thought i wouldn't see much and was so surprised!!!!). At the 18 week scan bub is so big u can't see the whole baby on the screen - just close ups - so while it's great to get a video for that - as we did - it's not very clear as it's all limbs and stuff up close. Generally the sex is determined at 18wks but my SIL found out at 12 wks she was having a son as supposedly the pelvis points upwards???? Well they were correct cause she gave birth to a boy in June. Have fun - it's a wonderful experience