Scared to accept Pregnancyb

Is anyone else apprehensive about accepting your pregnant and actually sit back and enjoy it. I had an early scan so although I know I'm defiantly pregnant I just can't seem to accept it until my next scan on Monday and when I see a heartbeat. I'm scared if I get to excited now then there's no heartbeat I'm gunna be even more broken if it all goes wrong. I'm so scared had a MC last summer and emotionally I didn't cope with it too well.