Thanks for the query.
Ovarian cysts and sciatica
are not problems with familial tendency in general.
And sometimes urine pregnancy
test kits may not detect early pregnancy.
So you better repeat the test after two to three days, possibly by that time you can get accurate result.
If the test comes positive, if can continue the pregnancy if you want.
If the test comes negative, you consult gynecologist and get evaluated to find out the cause for your delayed periods and take treatment accordingly.