First--is your nickname after the BYU cougars? I live in Utah so I wondered about that.:)
Don't know about the weak arms--but I am wondering if your heart palpitations are a symptom of anxiety.
I have anxiety when I am really stressed, like in the TWW--and my heart will palpitate like you explain.
Do you feel particularly stressed or nervous about something, or even about the pregnancy?
Maybe it could be anxiety?
Another possibility---I know that your blood volume increases greatly when pregnant, so it could be that your heart is just pumping much harder now, and so you feel it.
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