Early twin pregnancy, one baby’s sac is measuring 2 weeks smaller than baby

Jessica • Mom of 2 beautiful little girls 💗💗

Hi everyone! I had my first ultrasound yesterday and the ultrasound tech found two gestational sac’s! One baby is measuring 7w3d with a heartbeat of 163bpm. The other baby is measuring 6w4d with a 139bpm heartbeat, but their sac is only measuring in the 4 week range. So this baby is really squished and has very low fluid inside their sac. Does anyone have any experience with something like this happening to them? Just curious of possible outcomes…?