Yes. If you were really overtrained, your RP would not have responded so rapidly to rest.
I also take my standing resting HR just after my resting HR. When you're done with the RHR, stand and watch your HR for exactly 2 minutes. Record the average of your SRHR for the last 30 seconds. If you keep track of your SRHR, you'll find it'll give you earlier warning of over cooking it. RHR increase of 6-8 beats over normal is cause for concern. SRHR increase of 10 beats over normal means rest now.
http://www.pponline.co.uk/encyc/0410.htm#