re: Lack of/hard bowel movements

Nubeqa has a high incidence of constipation. I’m guessing that your iv chemo is docetaxel,and 3month shot is lupron which I wouldn’t suspect to be a culprit here.
I would suggest an otc stool softener, plenty of hydration. Increase activity level if possible. Add some fiber to diet. Senokot if you need a laxative. If you are taking any opioid pain meds there are some rx drugs such as Amitiza that can help with contsipation caused by pain meds. Of course clear any of this with your oncologist first.