Positive then negative puzzle

Re

Hi there, I was wondering if someone might know about this: I took a clearblue early detection yesterday, at 4 days late, and it shows two lines. Not strong but not like an evaporation line, either.

So I thought I’ll do the digital one today to see what that says (same brand / pack) and that’s negative.

I’m worried now that due to my age (43) I’m just not able to be hormonal enough. I was pregnant last September with suboptimal hcg Levels and miscarried, then again this February.

Of course the first big question is am I or am I not, and is it a bad sign that at 5 days late the levels are perhaps too low to read by some types of test?

Thanks for your thoughts. 🤔🙂