Missed period- pics included

Hi, so my period is always on time give a day either side. I'm now 5 days late. This is the first month we've  been trying. I've had cramps everyday since my period was due and had a little brown discharge at the time that they say could have been implantation, I've attached  ( 4 days before period due ) However I have no sore breasts and my temp is low around 97.8. I also have cyst in my ovary which is being taken out in a few months. Could this just be the cyst ? I've been aware of it for a year now and I've had no problems at all, no pain never had late for missed period. ( I just saw a lump with a full bladder) I've not tested yet as I just thought I was coming on but now I'm nervous the cyst is causing this. Any thoughts please?