Can a blood test be wrong at 15w

It said negative but I’ve read some people have had negatives w/ blood that were wrong but they got positives after 10-12w.

I haven’t gotten any symptoms the only thing concerning me is that my periods have been much lighter & shorter and I have twitches in my stomach but it’s in the same spot and in the same area.

But I do and have been getting LOTS of twitches all over my body.

I used a condom & pulled out.

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