First attempt at growing

I agree looks more like over watering. Unless you see the tips of your leaves starting to turn yellow/brown this would be one sign of nute burn. The curl sometimes shows up with nitrogen toxicity and or over watering. I would let her dry out a bit more than usual and see if she will hold her leaf blades out straight again. Most growers perform a flush when they switch over to bloom nutrients so once she recovers you can play it safe and do one on her. Try and lift the pot when she's drier so you can feel the weight and get used to when she needs to be watered.👍

Also if you have the time fill out more of your diary like what kind of lights, nutrients used pot size etc. it helps out to know the specifics of your grow.