Cutting teeth?

How did your babies act right before they cut teeth? My son will be 7 months next week, and the last couple days he’s really been acting like his mouth is bothering him. He shakes his head back and forth and rubs his gums with his fist or toys, yesterday he was drooling way more than he usually does( soaked the front of his shirt), today he’s not very interested in eating or taking his bottle. He’s been pretty cranky, very tired, not sleeping well. He hasn’t had a fever, or diarrhea, or any symptoms making me think he would be sick. I have a hard time looking at his gums because he’s so wiggly and doesn’t let me look for more than a second at a time, but I’m a first time mom and honestly I don’t know what I’m looking for, I don’t see any distinct teeth yet.