I had my first US today, baby measured 7 weeks and had a strong heartbeat. My gestational sac is only measuring 5 weeks. I have also had brown spotting for the last few days. Nothing on the US to explain the spotting, my doctor thinks I just have a sensitive cervix. Has anyone had a similar experience with a smaller gestational sac? Would like to hear your stories please! I had a MC in April and I’m really hoping this one sticks around!