Please help. Line disappeared!

Sarah • 26*Mom of 3*1st Tri with #4

I read the test at the five minute mark and took this phone at about 7 minutes. There was definitely a faint line! I got my kids ready for school, and looked at it again later and the line was gone. I was so excited and now I don't know what to think. I went and picked up a frer and held my pee for 3.5 hours. I feel like I may see a faint line but IDK. 😔