5 month sleep regression?

Hey ladies I need some advice! My daughter turned 5 months last week and she never went through the 4 month sleep regression everyone warned me about. I think she is going through it now; she will only fall asleep in my arms and when I go to put her in her crib she almost instantly wakes up, her naps don’t last longer than 30 mins, she just always wants to be held & is extremely cranky. Does this sound like a sleep regression? She was also born a month early so could that be maybe why she’s getting 4 month sleep regression at 5 months? Sorry FTM here