A negative urine test on day 33, with no intercourse during your fertile window, makes pregnancy very unlikely here. A delay like this usually means ovulation got pushed later that cycle, not that you're
pregnant.
Next Steps
If your period still hasn't started in another 3 to 4 days, repeat the urine test to confirm, and get a pelvic ultrasound plus a hormone panel done to check for a cause such as PCOS or
thyroid imbalance.
Health Tips
See a gynaecologist if this delay repeats over the next cycle or two, so the underlying cause can be found and managed properly.