heart rate and/or atenolol with pregnancy?

Emily

hey ya'll! I'm 5w1d right now and the last few days my heart has just been racing. I'm usually on atenolol for tachycardia, but it's a class D for pregnancy so I quit taking it when I found out I was pregnant. At first all was fine but now i feel like my heart is just constantly going fast between 80-90bpm all day today. Anyone else experiencing this and/or have been on atenolol with pregnancy? I'm worried my heart rate is going to effect the baby.