Aftr 18 days we checked two times one from ican n secnd time from pregasure it came out to be negative... both times
How effective these test are... one was one on 17th day night and other 18th day morning 5.30 am
We have unprotected sex.. bt i am sure ejaculation wasn't inside...
you don't need to worry about anything.
you can be rest assured that these tests are good and accurate.
although there can be chanced of false negative or false positive, but since you have done twice, its pretty accurate.