Any advice??

I am 19 days past ovulation and I am five days late for my period but I keep getting negative results. I have sore boobs off sometimes I feel shooting pains in my boobs and on my stomach feels rockhard. I have had mild cramping off anon some backache . nausea here and there I just don't know what to think anymore I had a blood test done when I was one day late for my period and it came back negative.  What should I do???