my sons penis has shrunk

K8
My son is 7 weeks old tomorrow.
At his 6 week check up the doctor said his balls aren't down into his sack yet.
Yesterday after a naked tummy time I noticed his penis had retracted into itself and it was looking a bit sore/red at the base of his penis.
Today it is still the same. I've tried googling it but nothing is showing.
Is this normal in baby boys? Wondering if it happens when their balls come down or if something else.
He is urinating with no issue.