Just went for my 6 week ultrasound to find out I was 5 weeks 1 day. We were only able to see the sac, which is normal for 5 weeks, but I am so confused! I know I ovulated late because we only had sex on the 18th and 19th day of cycle (we weren't really "trying") but all my apps put me at 6 weeks based off this info. I'm worried the baby isn't growing and if everything is ok that would mean I got a positive test at 3 weeks! Is that even possible?