Can a tubal pregnancy cause negative pregnancy results?
Patient: I was just wondering if you could get a negitive pregnancy result if you had a tubal pregnancy?  My last menstral cycle was March 20, today being April 3rd.  I'm 14 days late.  Took two tests both came back negitive. Minor stomach cramps here and there nothing major. Can you please help? Doctor: Hi,    Thanks for the query. I understand your concern.      I feel there is some error in writting last menses date. Any way.. I take it as 14 days delay in periods ..      One thing I want to make clear..  urine pregnancy test is reliable after 8 days delay in  period with regular menstrual cycle.       Pregnancy test done to diagnose pregnabcy shows a weak +ve with faint  test line). In case of doubt blood urine test or usg scan at 5 weeks of pregnancy can be done.    Thanks.