I'm 20 weeks tomorrow and ive got my scan on Wednesday afternoon. I heard baby's heartbeat at my 16 weeks mw appointment but this last week I've become increasingly anxious that things aren't progressing as they should. I have nothing to base this feeling on only that I feel my stomach is getting flatter and I'm able to pull my stomach in more than usual. Should I be worried or is it normal to all of sudden feel this anxious before the scan (I've been quite chilled from my 12 week scan and onwards)?