Placenta abruption

Allce
I had my first baby at 31 weeks due to placenta abruption he was in the nenatiol unit for 3 weeks his heart rate started dropping and I had to have an emergency c section he's 18 months old and is healthy and perfect. I'm currently 24 weeks pregnant with my second baby and I'm so scared she's going to turn up early I don't have a appointment with the consult until 30 weeks witch in my eyes is leaving it a bit late! What are the chances it could happen again I feel like I'm just waiting for it to happen I want to enjoy my pregnancy :(