Confused

Just looking for some advice… I took a pregnancy test 2 days after my period was due and got a (faint) positive. From then, I tested every morning with FMU and the line never darkened. It is clearly positive but there is no progression. I would have thought at that point using a early detection test would show very dark positives. I am 5 weeks 5 days now and still getting 2-3 on clearblue digital. Does anyone else have experience of this with a positive outcome? I don’t have any symptoms, pains or spotting and I’m just so confused and driving myself crazy 😓 I lost my son in September so am just super anxious.