"my stomach feels hard, could I be pregnant"

Answer:

You could be, but that isn't a symptom. You dont notice changes in your belly util later in the first trimester (it took me until week 13) but by the the time you are far enough along to notice changes you'll obviously know you're pregnant at that point. Bloat is normal because progestrone slows down the digestive system and it can be caused by other things too. The only way to know is to test, but as far as the hard stomach goes, it isn't really a symptom