Taking emergency contraception three times in one cycle can throw your hormones off enough to delay your period well past the usual week or two, so two months isn't unusual after that. Your negative urine test is a good sign, but one test this far out isn't the final word on its own with these pills.
Next Steps
Repeat the urine test, or ask for a blood beta-hCG test for a clearer answer. If both stay negative, book a gynaecologist visit to check your hormone levels and rule out anything else behind the delay.
Health Tips
See a doctor sooner if you get pelvic pain, unusual bleeding or feel unwell, since those need a direct check rather than a home test.