Has this ever happen to anyone?

So I'm getting really worried just notice white discharge today which is very abnormal for me.No smell no weird color.I am now nineteen days late for my period,I am getting pains in my left side mainly but it goes between left and right side.The pain isn't severly painful more annoying really.I asked my Dr. if she would check me out because I've gone through atleast 15 pregnancy test and they are all negative.The Dr told me I just should wait and do a preg test even though I have already done so many because she said hpt are as accurate as the blood drawn pregnancy test.Has anyone had anything similar happen to them? I'm so confused and worried.