I’m so confused! I have a 28 day cycle that is ALWAYS on time (over two years of it being on time every month). I had sex on CD 4 and CD 8 unprotected last month. I was supposed to ovulate on the 17th (but I wasn’t <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> so I don’t know).

My period is now 5 days late. I took a test two days ago and it was negative.

What are the chances I’m just skipping this cycle when it’s always on time and nothing in my life has changed? (No diet changes, added stress, etc)