Confused about due date

[rellorba]

Now, I know I JUST found out I'm pregnant! :p But I'm curious and confused and was hoping for some enlightenment from you wonderful ladies.

Before my first baby, my cycle was like clockwork, 28 days. My son is 7 months old now and I got AF back December 14 but took a HPT Dec. 28th and it was negative. Then on January 3, I noticed signs that made me think I was ovulating. And of course, I have had no bleeding since that first time.

I just took a test last night and it was positive. So, I feel like I ovulated late. I know the first cycle back can be crazy so I was not expecting to get pregnant. What date do you think I should use to calculate my due date?

[XanaduMama]

I'd go with O'ing on Jan 3, since it's later. You could go with a LMP of Dec 14, but then there'd be the assumption that you O'd 12/28. It won't make THAT much difference, but it's always safer IMO to have as much time as possible!

[rellorba]

Thanks!