Could I be pregnant?

So my last period was July 3-7th I've been ttc for awhile. So my partner and I had unprotected sex. I am irregular. On August 10 I took a OPK it was positive and a HPT it was negative. I had sex on the 11yh and 12th I tested a few days ago it was negative. Glow said my period is due on the 26th? Could I be pregnant? 

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