Need some Advice...

Regina
My period is a week late so last night I couldn't sleep and decided why not take a test? I had some cheap store brand tests (blue dye) and I got a faint positive around 1am my husband even saw it as well! Come this afternoon I took a first response rapid result to be sure and got a bfn. I was sad. But I did drink quite alot that day so I thought maybe that was the cause and so my hopes weren't totally crushed and I just planned on testing again in the morning, that faint positive still giving me hope but of course I just couldn't wait and took a clear blue digits and got not pregnant and im crushed. I still plan on testing in the morning but I'm just so sad. What do you guys think? Should I just believe the positive result? I've heard any positive is a positive no matter how faint. Could my hcg levels just not be high enough yet even though I'm a week late? Any advice or words of encouragement at all would be greatly appreciated 😞😞😞