HI, thanks for using healthcare magic
test look for HCG
which is secreted during pregnancy, initially the levels are low but they increase as the pregnancy progresses.
In most cases home pregnancy tests
should be able to confirm pregnancy by day 11 to 14.
You can consider repeating the test in 4 to 7 days to determine if it is truly negative.
The other option would be a blood test
, done by your doctor. HCG is picked up earlier in the blood.
I hope this helps