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, it's just more pronounced now
you should monitor your resting heart rate while you are training, I would consider this essential to your training and progress. Why you are noticing a more pronounced beat, is because as your are getting more fit, your heart is getting stronger and bigger, pumping more blood per beat, and your heart rate is lowering. That is good, thats what you want, but the reason to monitor your resting rate is because this should happen gradual over time, so if your resting heart rate fluctuates alot in a short amount of time this could be a indicator that you are over training and need to back off some before you get over trained.
Unfortantly if you are noticing a difference, you might be starting to get overtrained, but I would start monitoring it anyway. The best way to monitor it is to take your heart rate in the morning, at least a few minutes after you wake, but before you get out of bed. After you wake your blood pressure goes up some, so that is the reason to wait a few minutes before you take it. Take note of it, so that way if you notice a big fluctuation from one week to the next you will now to back off on the training some to avoid overtraining
anyway, thats more then you asked, but yeah, it is normal in athletes, and if you were to stop working out it would probably go away