Flat head at 4 months??

Alondra

My baby is 4 months old and I feel like he might have a flat head. I’ve tried tummy time and sitting him up and not always have him layed on his back. But I’ve feel like it’s not making much of a difference. My baby loves to sleep on his right side like he throws a fit everytime . But I still try to face his head straight when he’s fully asleep, but when I wake up he already turns his head to right side. Do you think he will need a helmet?