Irregular heartbeat

Hello ladies I’m 31 weeks and on Sunday I felt like I was having a heart attack. I’ve never had one in real life but I’ll assume that’s what I was feeling🤷🏽‍♀️ Anyway after that my heartbeat about 5 times and then pause. I’m pregnant with twins also! Has anyone else experience this? I went to my appointment today and my doctor was very concerned. She’s sending me to a cardiologist but she said it may take to to weeks which makes me even more nervous.