When does baby hold head up on own?

ju

Soooo i’m kinda freakin out. I’ve seen everyone else’s babies holding their head up already and doing things like that . My babies about to be 6 weeks old and she hates tummy time, only time she holds her head up by herself is when she’s on my chest but then she’ll just plop it right back down. When did your LO start holding their heads up??