How do you make a false positive pregnancy test?

I want to play an April Fools joke on one of my friends, and tell them that I am pregnant. I was wondering if anyone knew how to make a pregnancy test come up as positive without getting someone who is pregnant to pee on it, is that possible?How do you make a false positive pregnancy test?
draw a little plus sign in there, or you can have mine, I kept it.How do you make a false positive pregnancy test?
For accuracy in home pregnancy tests it is essential that you read the test results in the stipulated reaction time. If you let the test sit for too long (after the instructions on the box tell you), the test is invalid. This may cause it to show false positive results.
The only way is to have a pregnant woman pee on it.


Now wouldn't it be funny if you did it, and it came out positive! What a backfire
Draw the plus sign with a marker.





Otherwise the only thing that you can do is make a pregnant person pee on it.