terrified of 12 week scan HELP

hello ladies. I'm totally freaking out here and i just need some perspective . I have the big scan on Monday morning. The last time i got to a 12 wk scan it was a mmc and we Were totally totally shocked and upset. Since then i had a blighted ovum earlier in the year so I'm very worried about this pregnancy. At 7 weeks i had an emergency scan after bleeding and we saw the heartbeat. Then at 8 weeks i lost all my symptoms so at 9 w 1day i had another scan. Again we saw the little wriggly bean and i was dated at 9 weeks 6 so it had had a growth spurt. I'm still getting round ligament pain but no other symptoms aside from some very loose stools (sorry tmi) and last two dayS dull lower back ache. Anyone else had this and been ok? I cant sleep properly or think straight at the moment. my mmc was 8 weeks picked up at 12