Hi ! It could be an UTI, but morning after pill may not be responsible for the same. You have to exclude it by going for a routine urine test and a culture sensitivity test of the urine if need be and advised by your family physician.
Another possibility is the blood has come from the vagina, and is mixed in your urine putting you into confusion. If it is a vaginal bleeding, then a chance pregnancy
with incomplete miscarriage
has to be excluded by your family physician by doing a urine preg-test, a serum HCG
, and an ultrasound
abdomen if need be and advised by him/her.
WIshing you an early recovery.