I was wondering if anyone could help me out with figuring out the due date. This is my first child and I'm too impatient to wait until our appointment. :-) I have very irregular periods and was going for blood testing during the month of December to see when I ovulated. The date of my last period was November 29th and I went in for the blood test on December 19th. The test said I hadn't ovulated so I took another on the 27th of December and I had. On January 3rd, I got a positive pregnancy test. It was just a cheap Meijer brand one if that makes a difference. Glow asked me the average length of my cycle and I choose 40 days. So the app is saying I'm 3 weeks 6 days. Does that seem correct?