abdominal feelings

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Hi ladies! So we haven't been too "busy" this month, and I'm on cycle day 13 BUT all week long I've had lower abdomen feelings. Never had them before. Monday and Tuesday I was ravishingly HUNGRY and if I didn't eat RIGHT AWAY I felt sick. Lower abdomen still feels, well, different. Doesn't hurt, no cramps, but I can just FEEL it. I'm not sure how to explain. Tighter pants either have to go over the area or ride under it. Can't sleep very well and I can't get comfy. Took a test twice this week and got a BFN, also took OV tests and got nothing there but very light lines. Can anyone give me some insight? This would be our first so I don't know what to expect/look for. Thanks!