Negative bt positive test

So I did two cheapie test different brands and I got positives at 10dpo also on same day I got blood test witch was negative my period was due today but hasn’t came no bleeding at all I do feel sick and tired could it be possible I didn’t have enough hcg and I’m pregnant ? Don’t wanna waste more money if I’m not pregnant I would assume blood would have shown positive even if it was early ? Thoughts?