Anxiety about miscarriage

Last year I went into early labour at 19 weeks and lost my twins.. tomorrow I am 10 weeks pregnant with our 🌈 but my anxiety is through the roof and I’m so worried every day I’m going to have a miscarriage.

I’ve got my first midwife appointment tomorrow and we’re going to listen to the heart beat...I’m really worried that we won’t hear one and that she’s going to say I’ve lost the baby, I can’t get that thought out of my head! ☹️

However I last had a scan at 6 weeks 3 days and baby had a strong heartbeat..

Are you safer after hearing the heartbeat?

I’m trying to tell myself everything will be okay because only a month ago everything was fine and surely it will be again?

ALSO question: I always sleep on my left side but this morning I woke up on my back and freaked out! Will everything be okay? Will that affect anything? 💖