Trigger warning miscarriage talk !

So I’ve had 2 back to back miscarriages my most recent one was over a month ago like 5-6 weeks ago and my hcg levels were going down almost gone 2 weeks ago and I’ve been feeling super nauseous the past maybe week (we’ve had sex a lot since the Mc) and idk why but I took a pregnancy test like maybe 5-6 days ago a clear negative but I just took another one yesterday and I saw a super faint line on a cheap dollar tree test. So I bought a frfr test and I see a super faint like and it’s within the 3 minutes ... is it possible to be pregnant?! Or just like left over hcg maybe that negative a week ago was a fluke ?