I am late but negative?

Cory

I am 4 days late and I have taken 3 pregnancy test all negative? My cycle is usually 26-28 days I am not up to 29 days. Should I assume I am not pregnant and just abnormally late? My husband and I were active during my supposed ovulation. So confused. I can remember having cramps and have had weird symptoms ever since. Major bloating and super heighten sense of smell and horrible sleep. Help what should I think or do?