23DPO,No period,and all negative.

No I've never been late.. I tested at 8DPO I got a negative,tested at 11DPO and got a FAINT positive visible under light,tested at 14DPO with a Clear Blue Digital and got a negative also and tested at 18DPO with a life brand test and got a negative also.. I'm now late for my period and I didn't realize till this morning.. I don't even know what to think anymore:( I've been having cramps,lower back pain(that's gone) when I turn on my right side I don't know why but I get a little naseous,NO sore boobs but a while ago I had sore nipples that burned with I rubbed my finger tips across them.. My veins look more visible in my boobs and around my aerolas look darker but besides that nothing.. What do you all think? I have a doctor appointment Wednesday and I'm going to see if I can get a blood test.