Yeah for sure mate, especially if you say that 'in the past month I have been pushing really hard.' Sounds like your pushing your body to limits it hasn't been used to for some time, and it is trying to adapt and improve to cope with this stress. The ole' saying if you dont use it, you'll lose it, is so true in every respect to our bodies.
I have been lifting for about 10 years and I could hardly sit on the dunny this morning after a good
leg workout 2 days ago. I thought to myself, that'll teach me for taking it too easy lately!