Tryin to conceive. I'm 3 days late. On the day of expected period had backache, pinching around the ovaries but was neg. Now just backache. Pregnant?

Trust the test. Home pregnancy tests are very accurate. They are the same tests used in a doctor's office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection.