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If the pregnancy was outside uterus than also test must come positive. hCG <0.10 means no pregnancy. You can do ultrasound within five days which can be abdomen and per vaginal if you insist. But it will come as normal if hCG is low and urine pregnancy test is negative. The results of the blood test depend on laboratory but 99.99 % times it cannot be wrong if done in a proper laboratory.
In case of ectopic pregnancy mostly will have to remove tube laparoscopically. There are medical options but the results are not sure. It is a secondary thing and do not worry you do not have any pregnancy or ectopic pregnancy. Do urine pregnancy test once a week for two weeks and if they both turn out to be negative then forget everything.