Late PD, Negative Test

Khylie
I was supposed to start my period 5/6, and I'm late. I'm not really ever late, but if I am it's maybe by a day (based on this app). I took a test this morning and its negative.
The only difference this passed cycle was I had some blood clots and bleeding around 2 weeks ago, the day ovulation occurred on my calendar. I've never experienced that before. I'm so confused??!