Unknown due date

I KNOW I'm due in June.. But my last period was Septemeber 8th but I ovulated Sept 28 (I tested daily), so I'm either almost 5 weeks or almost 8 weeks. If I use the due date by period it says June 15 if I use Conception it's June 20 something. I'm so confused :( I'm already having nausea like I did with my daughter which started at 6 weeks. I have a 35 day cycle. Which date should I use?