Welcome to HCM,
As the size of stone is 4mm and it was present in the distal ureter
, there are 80% chances that you will pass it out spontaneously.
(i) It can pass out in about 5-7 days.
(ii) The stone once formed doesn't dissolve so fast. It is possible that it has left ureter and now present in urinary bladder
. When stone will pass out through urethra
, you may feel it passing.
(iii) The urethra can dilate to 4 mm easily.
(iv) Your rectal bleeding
can be due to piles.
(vi) There is no connection between ureter and anus.
You should drink more water, take urine alkaliser.
Watchful waiting for 4-6 weeks and USG follow up required.
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With good wishes,