How Do I Calculate Due Date w/o last period, but w/ Clomid dates?

I took Clomid 5/8–5/12 and am pregnant. I did not have a “last missed period” to judge how far along I am, but I know it has to be able to be calculated based on when I took Clomid and when I was ovulating. Any nurses or doctors who can calculate this? My appointment is in 2 weeks and I don’t want to wait that long!