i had svt during my pregnancy. one cardiologist told me it was safe to take inderal during pregnancy and another said it was not a great idea because it can cause heart block in baby. i chose not to take the inderal and suffered through my second trimester, but the svt got much better by my third trimester and was fine for my labor and delivery. It did not act up again until after I had my daughter and was nursing, so I took the inderal symptomatically and finally had an ablation about a year later. I dont know how involved your svt is, but taking the meds when you are feeling symptoms could be an option. My SVT has since recurred and I am also currently thinking about another pregnancy. I suggest that you talk to your OBGYN and cardiologist and see what they recommend. Good luck to you!!
I had PSVT during all three of my pregnancies ( no meds and before I even knew about ablations). The tachy times were a nuisance but other than that, the pregnancies and deliveries all went without a problem.