A little confused

Lisa

Well im 5 days late. I took a test yesterday morning it wasn't with fmu but I waited until at least 5 hours before testing with a first response. It came back negative. I took my first round of Letrozole. When I did my bloodwork on CD 21 it came back that I did not ovulate. So, now I'm sitting here wondering what could be going on. Could I have had ovulation later or is the Letrozole messing with my cycle? Any input would be helpful. Thank you. 😊