➕ or ➖?

I am on bc. Not ttc. My period was 2 weeks ago. Last cycle I took antibiotics and had unprotected sex and my period was weird. Since then all preg tests look like this. If its positive why is it not getting any darker ever?

Fist pic is dry, after 3ish hrs of taking it. 2nd pic is 3 mins within taking it.

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