Period late 7 days!

Hello Everyone! Ive been using the <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> since June 2018 to prevent pregnancy. This app has been such a help, but NOW as the title suggested, I am 7 days late. Now I usr protection during ovulation times, but I experienced 3 days of light spotting after Ovulation. now I am running close to another cycle, and CM is watery. Have any of ladies just missed a period altogether? I can possibly be pregnant, but it does seem rather unlikely because my parter and I have gotten the tracking down. Any similar experiences or advice? I am waiting until next week to take a test. Thanks in advance :)