Confusion

Okay, I should be able to figure out my due date after two kids right?!? I'm really confused. Help me out here if you know which is right!

I calculated my due date as February 16th- so I would be 11 weeks right now. (Going off of May 12 at LMP) Baby Center says I'm due Feb 19th and 10 weeks along, Fit Pregnancy says I'm due Feb. 16th and 11 weeks along (which is what I was thinking). Of course I have not had my sonogram yet, it's still a week and a half away. I found one site that said you add 7 days to your LMP and then count back 3 months...and that would give me a due date of Feb. 19th.

Why is this so confusing to me this time around?!?! Any thoughts?

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