Hi Birdwatcher
If you have no helpline number from the hospital (I did after my hysterectomy) then I would either ring your GP or the gynae's sec & ask for advice. Not suggesting this is anything major, but this soon post-op I think you need to get it checked out asap for peace of mind.
If there has been constipation as a result of the surgery/anaesthetic - & it can go on an awfully long time
that could perhaps also be a cause.
If scars are minimal it can be easy to underestimate the extent of what's been done, so be sure to take good care of yourself & follow all the post-op guidelines re resting & avoiding lifting etc, as this will help with healing.
Wx