You should repeat doing your pregnancy
test (it is quite possible that you did not it properly). You should also be examined by ultrasound
to reveal other possible causes of delaying your period (ovarian cysts: follicular, corpus luteum
cyst, policystic ovarian sysndrom, etc.). If you have extrauterine a usual pregnancy test can be also negative (INEXSCREEN-test can be used) but blood analysis for Human chorionic gonadotropin
(HCG) has to be taken to exlude pregnancy with 100% probability. If it is done your hormonal panel should be investigated.
Wish you Good Health
Dr O. Aleksandrov