Calculating due date

I’m logging my data in pregnancy apps. My last period was 10 weeks ago, but if I ovulated late am I 10 weeks pregnant, or am I 8 weeks pregnant? Should I still put my data in as my last period or as two weeks before I think I ovulated/conceived?

Edit: I don’t know for sure if I ovulated and conceived then, but i thought I did due to cervical mucus. But I’ve had egg white cm on and off for weeks, so I’m not sure if i ovulated then or if it was just the beginning of ew cm