Am I pregnant again already after miscarriage a month ago?

Three weeks ago my HCG was down to 40 and I watched my tests go negative. Last night I had a tiny bit of brown spotting so I took a test and it had the teeniest faint line and I chalked it up to being leftover HCG , but today I re tested and it looks darker to me… could I be pregnant again already or is this old stuff? I may have ovulated on 1/29 as I had pains in my ovary.

Today

Last night

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