Welcome to all the new arrivals! On the topic of early scans, I managed without but mostly because I didn't realise I was pregnant until fairly late on. General wisdom seems to be 8 weeks is about the right time. I definitely second the advice of getting booked in ASAP. If your area is anything like mine, there might be quite a backlog of pregnant ladies...
Jpeg, I had lots of cramping on and off in the first trimester. The MW assured me it was likely to be resulting from everything moving and stretching in there, and was only a cause for concern with other symptoms. I know it doesn't help much with the 'but what if...?' mentality 
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Whatser, was it you who mentioned the feeling of not trusting your body? (apologies if I've got that wrong, this thread moves so fast these days!) I have found that a combination of pregnancy yoga and mindfulness/ hypnobirthing-style relaxation/affirmation recordings have, surprisingly, really helped me in this regard. I am not on of those naturally sunny, positive person and the cynic in me would have told you these techniques and philosophies would be of no help in my case. I was wrong. I think I am starting to let go of those negativities and fears, although even that is scary to say. Especially as the weeks go on, I would really recommend (to anyone!) giving something similar a go.
Butterfly, glad it went well yesterday. Also so good to hear that they are offering you some extra MH support. I really hope it proves helpful.
Purple and Kate, good luck today. Thinking of you both.
I had my 25 week MW appointment today. She listened to the heartbeat (beating away) and measured me (same number of weeks as centimetres) so that was all good. For everyone with early days worries at the moment, it really does get better. It's never going to be the same as a pregnancy before a loss, but for me at least, I am able to acknowledge the positives as well as recognising my fears much better as time goes on.
Thinking all the good thoughts for everyone here, you all deserve happy endings .