Pregnancy Tachycardia?

Has anyone here experienced tachycardia during pregnancy? I’m currently 35 weeks, but starting at around 33 weeks I have been having 1-2 episodes per week where I get lightheaded, feel faint, and shortly after my Apple Watch alerts me that my heart rate has exceeded 120bpm while at rest. These events ALWAYS happen while I’m sitting or lying down. I am never feeling anxious before hand, I just start feeling weird. Of course after the alert I’m hit with a flood of anxiety which makes it difficult to bring down my heart rate. Today I got up to 127bpm lying down, and it took me about an hour to get it down to under 100. I’ve talked to my OB about this and they did an EKG, which did show my heart rate fluctuating up and down quite a bit. They said they’d refer me out to a cardiologist, but it’s been almost two weeks and I haven’t been contacted regarding the referral, nor have I been able to get additional information about the referral when contacting my OB. Have any of you experienced this? What was the outcome?

Note: I’ve cut out caffeine and most sugar since this has been happening.