I'm Late

According to Glow I'm 4 days late, my cycle comes like clock work every month and sometimes early by a day? I have taken 2 test but both were a strong Negative. I have slight cramps but nothing is happening. When I was pregnant previously I had sore boobsx nausea, the works. I'm unsure of what to think at this time. Can anyone help ?

BTW my cycle was April 3-7.