Hello
Thanks for writing to us with your health concern.
Abilify is known to have a side effect of muscle twitching.
As such, you have no symptoms such as calf tenderness, pain or redness, so I would not worry about blood clots due to the Nuvaring.
I am more of the opinion that it is Abilify which is causing this.
Please discuss it with your prescribing doctor, and have the medication tapered / modified.
All the best
Please feel free to discuss further.