Daycare concern

My child had a hard time being dropped off at daycare for a little bit but then soon got used to it and didn’t have a problem going anymore. Recently, when I go to drop him off, he screams and cries and clings onto me and doesn’t want to be put down at all. He screams bloody murder and this is completely out of character for him. as all kids do, he falls sometimes and gets bumps and bruises and it’s hard to tell when or where he got the bruise but I feel like some of the bruises on his legs are From a hand, like finger marks from someone holding him by his leg, or holding his leg, too tight, causing 4 little finger size bruises below his knee. maybe from changing him or something? I’m not sure, but I know that myself and my husband don’t hold his legs when we change him And they’re just constant. There’s always bruises there and I’m starting to think that something is happening at his daycare that’s making him so scared to be there and causing these bruises. there was new people in the room for a few days that I was hesitant to leave him with but it’s his original teachers now and something is just telling me that there’s something going on. My gut feeling and this awful feeling I have is so strong that I just left work to go check up on him at the daycare, even though I know he’s asleep right now. I know to trust my gut, I don’t know if I’m just being paranoid or what because I really don’t want to put him in a new classroom for no reason and have him get used to these teachers and the kids but I also don’t think I fully trust these people, I don’t fully trust anyone if I’m being honest. so no place and no one has ever sat right with me. I’ve even been having nightmares about his current teacher and I just want to take him out altogether but I have no friends or family able to help, my husband is not currently home and won’t be for months, it’s just me and I have very little options. I can’t tell if I feel this way because I don’t trust anyone with my baby (16mo) and I hate the idea of daycare to begin with, or because something is actually wrong in the classroom. There are cameras in the rooms, I’ve never seen them mistreat my son or any other kid, I don’t really HAVE a reason not to trust anyone there besides the fact that I don’t know them personally, I’m just SUPPOSE to trust them. The only thing I saw a teacher do to my child was smack a ball out of his hand because he was holding it in an area where he wasn’t suppose to..? (To close to the slide I guess?) but after that happened I haven’t seen that teacher again, and this was before he started freaking out when we got here