Homemade pregnancy test

So I took a DIY pregnancy test at home because I had unprotected sex about 3 weeks ago and just wanted to be sure I wasn't pregnant but didn't wanna go out and buy a test just yet. So I saw that if you pee in a cup then add bleach it would fizz/foam if you are pregnant, mine did and I'm extremely worried but also confused as to how accurate this is. Has anyone done this before?😩