Fast heart beat !?! Please help

Keshia • Been ttc about 5years.. Now I'm 4 weeks as of November the 1 ... Really happy at this point, I'm n love already
Ok I have a question!! Its three days before my cycle starts, but for the past week or so every time I go to sleep I wake up out my sleep, and my heart is beating fast n hard.... Could this mean I might be pregnant?