Confused!

Kerri
So I had my last period April 17th. And according to glow, i ovulated on May 4th till the 10th. And we had sex on May 8th. My OB hasn't seen me yet, but she gave me a due date of January 22. That would make me 6 weeks and 5 days. All of the apps say I conceived on May 1st. But I couldn't have because I just had back surgery. Someone please help me. I'm so lost!