Could I be?

Hey all....I'm new at this so any insight is greatly appreciated..here goes...I've never been pregnant before but I usually start on time...we have sex almost every 2-3 days but we have been trying for a year now..I'm now a week late and now my stomach feels like I did 1000 sit-ups...I know that late period could be a sign but what about my stomach pain? Should I wait another week before taking a test? Thank you!