bronchitis and late AF

Ellie • Engaged to my soulmate💏and newly a SAHM to a 8 year old boy 👶🏽 4 year old girl and my newest baby girl born 1/25/18👶🏽👶🏽🎀🎀 💕
AF is a couple days late, I'm on CD 34. No symptoms except today I had some cramping that lasted all of a few minutes.
I haven't taken a test to avoid possible disappointment.
My question is.. what is the likelihood that my sickness has caused AF to be late? 
Has anyone experienced this and ended up being pregnant?