HELP- small fundal height

28 weeks and fundal height is measuring at 23. Tough to know what’s going on because this was their baseline measurement for me- they have never measured before.

They don’t know if baby is sideways affecting the measurement, if I would normally measure small, or if something is going on with baby. Heartbeat and movements are right where they should be. I’m paranoid about measuring that far behind. 20 week ultrasound measurements were good- going for growth ultrasound on Tuesday to check it out. She said I could also go to L&D if I really wanted to go in earlier.

Anyone have similar experiences or know anyone else who has!?