Two missed periods, negative tests

F

My last period was 57 days ago. My period comes like clockwork every month. I took plan B during my last ovulation cycle, because we were still discussing baby #3, but now I'm worried there won't be a baby #3... I was very nauseous and had sore boobs right around the time of my period, but then it never came and those symptoms disappeared... Will my period ever come back??? Has anyone experienced anything like this???