No due date yet?

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So my doctor hasn’t given me an official due date yet. I got a positive on 4/2 and when I had my first ultrasound I was only measuring at 6 weeks when I should have been 8 according to my last period. I had another ultrasound this Friday and should have been 10 weeks per my first ultrasound but am now measuring closer to 12 weeks. I have another ultrasound on Thursday to get an actual due date. Anyone else dealing with this?