Given the timing, I expect that this is unrelated to the cycle. These aren't known side effects of the drugs at all, let alone as such a delayed side effect, and as far as damaging nerves from improper injections, effect would be prompt, not delayed.
I don't know the cause. Most people (I think) have on occasion had random twitches for no cause at all -- certainly it's common anyway, whether most people or just many -- but a repeated issue is unusual and unfortunately I don't know anything on it.
Possibly a response to some training strain that hit both legs similarly? (Total guessing)