Uti or miscarriage symptoms

Patient: I am trying to get pregnant. i finally missed my period a few days ago, but today i experienced a dark urine with cream or white flakes in the toilet. i would like to know what this means. it has not been far along enough for me to have a miscarriage or take a urine pregnancy test.

Symptoms: Occasional upset stomach but never threw up, first time its happened, first ever missed period, dark yellow urine, many white flakes, i have never been pregnant.