11 days late, I need some help please ladies

[ErinSheppard]

Hi y'all! I'm currently 11 days late for my period. I've been taking birth control pills and have always gotten my period on time. I've taken serval tests but they have all come back negative. I've had what feels like I've started and when I go check it's just thick CM. I've been pretty nauseated the past 3 days and have thrown up a few times. I've gotten a few slight cramps like a period but not as painful. I'm extremely moody and have snapped at my boyfriend over everything. I did have unprotected sex while I was ovulating. I missed one of my BC pills at the beginning of June but doubled up the next day. I ovulated most on June 13th-15th and had sex on all those days. I just want answers!!!! The last time I took a test was 3 days ago and the main window was a very faint blue negative but the other window was an extremely dark blue. Please help ladies!