Any other moms currently going through this?

My son is in his second week of daycare, going 3 days a week. Prior to starting, he put himself to sleep for naps and nighttime usually within 5-10 minutes with no crying, just chatting to himself and sucking his thumb. Now he screams for every nap and bedtime while I’m getting him ready cause he knows what’s coming. He was so worked up the other night and presumably very overtired that I rocked him to sleep and laid him in the crib. Last night I stayed in his room while he fell asleep to avoid him getting so worked up, and while there was no crying, he took 40 minutes to finally fall asleep! I checked in with daycare today and was told that he goes to sleep with no tears while he’s there and he’s usually asleep in 2 minutes. Is this separation anxiety? What can I do to help him?