Need answers!

Chevy • Amir’s Mommy✨👶🏾💙😍
My name is Shavon. I'm 22 and trying to conceive with my wonderful boyfriend of 2 years. He already has two beautiful girls who I love as if they were mine. But ok, enough about me here's where I need answers..... So about a week ago I took a pregnancy test because I was almost a week late. One came back negative cool.... So I took another one to me it seem like it was negative so I didn't pay it any mind I just took it as i wasn't pregnant. I put the test back in the box and tucked it away..... So yesterday I went to throw the test away and one was still saying negative and I checked the second one and it had a faint line saying positive..... What could this mean??? This test been sitting for almost a week!!!! What should I do???