Help on due date?

courtney

I'm trying to figure out what my due date is. I'm getting so many different ones online with the calculators. I've counted from my conception date (june 27th) to now which is 3 weeks and I think 2 days now? But based off the start of my last period (june 6th) it's coming up with a million different ones. I've gotten anywhere from 6 weeks to 3 weeks. I have no idea and dont see a doctor till august first. Can anyone possibly help me figure this out?!