Please help

So I have had all the symptoms plus some, so I took a test yesterday 10/19 really late at night Bc my period didn’t show. The bathroom I took it In had such dark lighting so I thought it was negative. Flash forward to today 10/20 about 6 pm still no period and the pack came with two test so I got the second one took it and got this...(pic below) I see a very very faint line but idk if it just me. So I ran to Walmart got another test took it and it was negative... what does this mean. I did take my test within an hour of each other at night time so it might be that my hcg level was too low the second time Let me know what you think please and thank you