Ok this is gonna be a long post but i need some advice!!! My daughter was really calm and didn't really cry from birth…

Ok this is gonna be a long post but i need some advice!!! My daughter was really calm and didn't really cry from birth through about 2 1/2 months . She just turned 3 months old and for the past two weeks it's like she's a different baby! She started sleeping through the night about a month ago but during the day she just cries on and off and really only stops when i nurse her. I don't think it's my milk supply because she's gaining weight and seems full right after . I don't think it's colic because the crying isn't consistent. She stops and then cries again. She's starting to drool more and sucks on her fingers a lot. Could it be teething? She doesn't seem to have problems passing gas and always burps after feedings. She doesn't poop everyday like she used to but I was told it's normal for an EBF baby to go up to a week without pooping. She has yet to take a bottle and doesn't like pacifiers ( I've tried 3 different ones so far). Idk what could be bothering her to make her change like that overnight and cry all day. I'm worried this is just how she's gonna be for a while. Is anyone else going through this or have any of your kids gone through this in the past? What did you do to stop the crying? I don't think my son was ever like this.