curious...

Shandra • Married mother of 2 boys--15 yo and 4 yo; Fourth Grade ELA/SS 👩🏻‍🏫
We saw a baby... yay!  Confirms 8 weeks along. 
Doctor wants us to return in two weeks because my progesterone is a little low, and the heart rate is 129.  He said it is within normal range, just on the low side.  
Should I be worried?