Symptoms as soon as 4-5 weeks?

Are you ladies experiencing symptoms yet? I've had some; sore, sometimes even itchy nipples, mild cramping, lower back pain, and fatigue but the symptoms aren't consistently there. I tend to experience them mostly in the evening/night or morning. Just wondering if this was "normal" since this is my first pregnancy and I have no idea what to expect. Is it too soon to "feel" pregnant?