As you have stone in kidney
of 2-3 cm , but you didnt mention that you are taking any treatment for stone or not.
if not taking any treatment for stone you should take the cosultation from urologist
and start treatment as advise.
at this time may be risk ful becouse during the act it may displace from the site and can obstruct in the ureter
and this situation is an emergency.
so it will be better to avoid