I am experiancing svt while in my late second trimester of pregnancy 3years ago I had an ablation done to fix problem I use to take toprol xl for 2years.now that I m pregnant it has returned I feel like I m gonna faint ,very out of breath and exhausted,my episodes last 1-2hrs.at a time and abruptly stop.I have a heart appt.with my cardiolgist coming up but very worried about baby,should I be taking it easy for now on.