I think you are not pregnant because pregnancy
tests are very sensitive to HCG (Human chorionic gonadotropin
) level in urine. However your blood should be investigated to check HCG (0-10 IU - normal). You should be also examined by ultrasound
to reveal other possible causes of abnormal periods (ovarian cysts, endometriosis
) with hormonal panel to be inspected as well. You should take your pills regularly because if you forget it can make your periods irregular with unexpected bleedings.
Wish you Good Health
Dr O. Aleksandrov