BFP for our rainbow!

Got my BFP for our rainbow baby this morning but I'm so terrified of losing this one I'm too scared to be excited. I had no symptoms last time and had a mmc at 12 weeks, where they said it hadn't developed past 5 or 6 weeks. I don't think I have any symptoms again. No sore boobs, felt a bit nauseous in the evenings the last couple of days but not sure if I'm imagining it. How do I keep myself together over the next few weeks until I can have an early scan?