i recently got my cat neutered, it’s been about 2-3 weeks, he’s been normal! but a couple of days ago i started noticing that after he uses the litter box he will start hissing and crying like he is in pain, but when i check there is no blood in the litter or anything?! i am so confused? should it take him to the vet or is this normal?! also he only does it for a couple of minutes (like 1-2) and then stop?