Surprise!! Twins!

Lauren

Y’all my husband and I went in for a ultrasound, and there was two heart beats! I’m only 9w2d and we weren’t sure if it was 2 babies but when she moved it across my belly it would show another part of the baby! Is it possible to have one baby behind the other making it harder to get a measurement or even see the baby at 9 weeks? We had the heartbeat and heard it and got it on our recording but I’m just curious if that’s normal or if anyone else had experienced this with twins! Thanks!!