Help?

Danielle

Ok I'm 23 and I've been trying to get pregnant for 4 months with nothing,. Aunt flow is 15 days late but every test I've taken has been negative, including the one I took yesterday. I've had a few symptoms like I've been nauseous, and when I'm not sick to my stomach I'm starving, and I've been exhausted. I've been cramping but they feel more like gas than menstrual cramps.