Just Wondering?

Alisia • Love God first, Wife, and Mother of Two Boys!!! Maybe the third boy in August 2016💑👪🚼👶🎉🎊🎆✨✨✨ 1
I'm two days late for AF. I was suppose to get it on the 30th I've already taken one pregnancy test and it looked negative to me....I'm not on any medication, not really stress, or sick so I'm thinking maybe I ovulated later than what I thought or in having a cycle change....Thoughts please on this??? Thanks