Hi Ms. Samantha,
In the current scenario, it appears as though your untreated urinary tract infection
could be the culprit for the delayed period. It is always advisable to get such infections completely cured so as to avoid future difficulties. HPTs may not give you a definite result until 3-7 days after a delayed period. For a better confirmation, you may get the serum beta-hCG
assay along with a trans-vaginal sonogram. Hope your query is answered. Take care.