Very late period

My partner and I are trying for a baby! My last depo shot was in April 2017. My period came back in November 2017 and was heavy and regular each month. I am now 12 days late. My cycle is usually around 30 days each month but this month my cycle is 42 days and counting! I took a pregnancy test today and it was negative, I did take it in the afternoon which was the wrong time to take it but I was just really hoping it was going to be positive. I am gutted but do have another test to take in the morning.. Not expecting exciting news after today's test. Has anyone experienced the same?