Welcome to all the new ladies 
leluella I'm sympton spying too - I'm due later in the April (20th) and it's interesting to see what I mgiht have in store!
Babyjames Hope your spotting is easing off, you had fun at the weeding and you're feeling a little more positive. Have you rescheduled your apt?
Teapig could you give your GP a call in the morning? I went to the docs to let them know earlier this week and asked who I should call at this stage if there was anything I was worried about and he said first port of call would be them and that it's better to call than worry.
I think the worrying is natural, I'm flitting between excitment and worrying about:
symptoms, lack of symptoms, if xyz is normal, when to tell people, how and when to tell work (I swear some of the girls are already on to me and I really don't want them to know until after the 12 week scan - everyone will be nice about it but I know I'll feel guilty as it's a small company and I'm not sure how they'll cover for maternity), what to eat, what not to eat, how much to eat .... and breath! 
Most of the time I'm just trying not to get too excited too early.
I hope no one is worrying too much!
5+1
(I also like the listing of the weeks at the end - I got totally confused earlier in the week trying to figure out where I was in relation to others)