Thanks for your query,
If there are two lines in pregnancy
test ,then it is considered positive. For the line tests, any colored line, no matter how faint, in the result window during the alotted time is a positive result.Usually vanishing positives are actually a negative result and you are not pregnant. Some tests will tell you to confirm a negative result at 3 minutes or 5 minutes. Confirmation pf pregnancy may be done by USG scan.
Hope it helps..