BFN & BFP??

So I had a miscarriage at 17 weeks and had a d&e; almost 5 weeks ago.

Since then I started taking the cheapie test strips and got lots of negatives pretty soon after.

I now still haven’t got my period and I have been feeling a little “off” so I took a FRER pregnancy test and have been getting very very faint positives (total of 3 days now) but still negatives on the cheapies? Possibly left over from my previous pregnancy? Is it possibly a new pregnancy even though they haven’t got any darker and my hcg isn’t high enough for the cheapies??

Looking for any advice