Womb cancer pain

Hi. I’m a 75 year old diagnosed in April this year with Grade 1 womb cancer (named Charlie) and have been fitted with a Mirena coil.  I was given a copy of Macmillan’s booklet “Understanding womb cancer” but can’t find anything specific on pain. What sort of pain should I expect?  I can’t imagine I would be pain free with a Charlie around. 

As I have arthritis and damaged discs in my lower spine I already have chronic pain but can only use Paracetamol as anything stronger “will interfere with my heart medication”.  I’m just trying to gauge how much more pain I will have to contend with having Charlie as well. Any information will be appreciated.   Many thanks.