I don't know what's become of the OP, but for anyone else in TWW and wondering about this, my symptoms (cramps & sore boobs) have definitely been off & on, and I got a bfp.
For days, I can go with no cramps. Then they come punching back again.
Some days my boobs feel normal, but then the soreness returns eventually.
Hormone fluctuations, I guess.
For a long time, I just thought it was pms being flakey.