Is this an indent or what is that line?

I took this strip test yesterday and had an odd line on it idk if it's just an indent line or what. It was taken within the timeframe too. I'm about 13 days late for af now and no sign of it coming. My boobs are still sore tender and I've been very tired feeling lately also I've had some more nausea than normal too around 3:30pm to 4pm is when I feel nauseous. Only one pic is edited. Has anyone had a odd line like this before on your strip tests? The brand I'm using is bfp pregnancy test strips