Help me I'm so worried and scared

So I just some reassurance!!! I am 12+3 going for my scan tomorrow but all I can do is worry that there is something wrong, or for some reason the baby doesn't exist!! So far iv had a lovely pregnancy granted iv had horrific morning sickness and my boons kill me but iv had no scares no nasty cramps or bleeding or anything of the sort!!! Am I just been silly!!!!