Missed period with a negative pregnancy tests

Shannon

I’m hoping for some guidance here. Last Monday (6 days ago), I thought I started my period with on my scheduled first day with a normal light first day. Tuesday, I had no spotting or anything and that continued for the rest of the week. I took a pregnancy test Wednesday and again yesterday, both were negative. I’ve never had this happen, I do have extra stress at work, but that has never changed my period before. Now, the app is telling me I’m starting my ovulation cycle, but I never had a period. I’m just very confused... any advice?