I went for my first U/S today. From my calculations I am 7 1/2 weeks but the baby is measuring 6-6 1/2 weeks. We did see a good heartbeat. My doctor feels that we have a 50% cchance of miscarraige at this point since he has a concern that the baby may not be developing properly. I have to go back next week for a repeat u/s. I am freaking out hysterical mess. Has this happened to anyone else? I need any info i can get.