Help! Positive yesterday, no line tonight

Rose

I got a BFP yesterday morning on a digital, and a super faint positive on a dollar tree test. Tonight I took another couple of dollar tree tests just to see, and there was nothing!!! Is this a sign of a chemical? Or am I just stressing myself out for no reason? I know it’s only been a day and it’s night time now, but I can’t help it. I want this baby so bad. Anyone have any advice or experience in this??