Confused please help

July 5th I had a period of 7 days .... July 29 I had sex with guy A ... had a period for 3 days,

August 2nd & 7th I had sex with guy B ... i am currently 14 Weeks & 2 Days pregnant

I don’t understand why it says the i ovulated 08/14/2018 but says I’m 2 weeks pregnant .. it also gives me dates from August that I could have gotten pregnant from & I was ONLY with GUY B in August ... I do plan on doing DNA test but rn every math I do or research it all leads back to Guy B ..: what are your thoughts