Advice needed pregnant after a loss

Hi need some incouragement. I am 12 weeks pregnant and got my 1st scan in 2 hours time. I am nervous and scared. Because a few months ago I had a mmc at 11 weeks. I need to think positive. But it's very hard. Feel like I can't breath properly and feels like I can burst out crying. I am scared to sit in the waiting room and for my name to be called out to go have the scan. Any ideas or help ladies xx