Chances of miscarriage 12 days dpo?

Madison

Hi everyone, I found out I was expecting three days ago at 9 DPO. I’m two days away from my missed period... the first positive was a Kroger brand, then a Walmart cheapie, I got two VERY light lines on FRER and yesterday, a very clear positive on FRER. Ive been having dull aching back cramps and just being neurotic so I took another cvs brand one today and the positive line was clearly there but I felt like it should be darker ... I think I’m just terrified of having a miscarriage and freaking myself out because I have not missed AF yet... do you think there’s anything to worry about?