If I saw the heart beat at 8 weeks 3 days will I be ok on Friday at my 12 weeks scan?

I saw my little babe at 8 weeks 3 days. Even a flicker of her heart beat. Everything is going well. I’m so paranoid something will be wrong at my 12 week scan but I’ve been feeling lots of stretching and pulling pains all week. I’m hoping that’s a good sign. So paranoid of a missed miscarriage... but have read that lots of ladies babies stopped growing at 6 weeks then found out at 12 weeks. Anyone can relate?