Hello and Welcome to 'Ask A Doctor' service. I have reviewed your query and here is my advice.
Sometimes urine pregnancy
test may not give accurate result. And irregular periods
due to PCOS
can also be one cause for delayed periods. So, you better go for blood investigation - measurement of beta HCG
levels in blood. If that is more than, the possibility of pregnancy is there. Less than rule outs the possibility of pregnancy. If it between 5 to 25, you have to repeat the test.
Hope I have answered your query. Let me know if I can assist you further.