Faint positive at 16 dpo - Should I be worried?

[AmyG18]

Hello,
I'm really nervous. I use ovusense core temperature monitor that confirmed ovulation. I am 16 dpo and my tests are very faint. I had a MMC in September and this is the first month we have tried. I wear a fit bit and my resting heart rate is high, it's only ever been 62 when I was last pregnant. I have no signs of my period coming. I'm worried this could be chemical.Any success stories from anyone else with faint lines?

I would maybe use a digital, and dip in a sample, don’t pee on the test. There seems to be dye bleed around the control line, and some banding- almost a second test line-to the left of the test. (Left if it was the right way up I mean)