just look for answers

So my husband and had been trying to convince a couple of months back and I couldn't get pregnant so we stop and decided it wasn't are time but when we started that's when I got the glow app so I kept it to track my cycles and my cycles been coming on the days it says but this month is different I missed my cycle already I took a test and it was negative.. so I guess my question is have any of you ladies ever had this happened to