Af due 09/22

Erica

Please help me, my af is due on 9/22... I tested and there is a BFN, today I have having pain in my bottom right side of my stomach as if it's a cyst... there sho be any cyst because I went to the doctor last week and got a TVU and came back clear and cyst free! My beast are swollen and I've been tired lately... could it be possible I've tested to early?