Heart Palpitations and possibly Contactions/BH

Okay so I'm gonna go out on a limb here and say I get this breath taking uneasy feeling in my chest everytime I have a contraction/BH. I'm unsure of whether or not it's one or the other because its painful. The heart thing lasts for about a minute or two and then it's gone! I usually feel it before the contraction/BH I have a history of SVT( heart rate was 400bpm+ I was shocked and had surgery in 09) that's been corrected, I'm not on meds, and now my heart has only been in bradycardia/sinus tachycardia depending on how I'm feeling and what's going on with me! Idk what to do I feel baby moving around and so I'm not super worried about baby just my heart so far she's been healthy and everything is going good besides hyperemesis gravidarum(sp) horrible morning sickness....anyone have similar issues or know what this could be!? Could this be a sign of preeclampsia? My second baby boy was taken early do to high heart rate and his dropping.... first born was perfect.... this is my third and finale...I'm 25 weeks 4 days currently!! Thanks and PS I've already set up a doctor's appointment for the 12th don't need hassled about talking to OB!