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About two weeks.
Saliva and urine drug test -YES, but the best will be to home test yourself using One or 5 or 7 panel home drug test kit (from any CVS). Hair drug test- NO
You can go to any pharmacy and pick up a home pregnancy test. This is a stick which will detect pregnancy through urine. They are fairly reliable but to be 100% sure you should visit a clinic and get a blood test.
A home pregnancy test is most likely to be accurate if it is positive meaning if you had a negative test you should be monitoring if you could be pregnant. You could have taken the home test too early to detect pregnancy. The best thing to do is to go to the doctor and get a test done there to rule out pregnancy.
You shouldn't be doing drugs in the first place!
It may mean that you have taken the test to early, best to go and see your doctor or wait for a week and take another test.
There are many home pregnancy tests for your friend to use. Home pregnancy test are pretty much the same in terms of accuracy and reliability, so I would recommend the pregnancy test that is the cheapest at a local grocery store or pharmacy.
You can get a positive result on a home pregnancy test as soon as 8 days past ovulation. However if you test that early you are more likely to get a negative even if you are pregnant. It is best to wait until the day you miss your period to have the best chance of getting a correct reading.
what is the best testing kit to use to detect cocaine
Yes you can take a test at home.
In my opinion the best one would be the true blue test. This one has very good reviews and a lot of people have used them. I would avoid buying them from a dollar store.
The one the doctor gives you but for home pregnancy tests they are pretty equal.