Okay I know this is dumb but..

I'm totally freaking out! I see the faintest line on this test! I took the test first thing in the morning and was sleepy so didn't look at it until an hour later.. I know that they are invalid after ten min, but Idk when this showed up! What do you all think? I really don't want to be pregnant. I'm on birth control, but I started bleeding mid cycle and my doctor told me to take a test just in case. My kid is 10 months old, so I'm not ready.