3 days late AF is never late

Porchia
AF is late temps have been high and remained high hpts have been negative. The last time I was late I was pregnant I tested the day after my MP and it came up negative I dismissed it as stress I ended up having a miscarriage at about 12weeks. My temps dropped about 4DPO and have been steadily high since then mild cramping in the center of my uterus. Any advice?