So my period is 4 days late and I've taken 2 tests and they've both been negative. I'm constantly so tired and my boobs are killing me they're so tender to touch. In my heart I was hoping I was pregnant but my tablets say that 1 in 100 could experience infrequent menstrual cycles, I've only been on these tablets for a week so I thought it couldn't be them but maybe it was. What's does anyone think?