Excess discharge instead of period

So I'm on birth control but missed a day, but doubled up the next day, now I'm supposed to start my period but I'm 3 days late and ALOT of discharge is coming out. Help me out ladies. My dr had previously said since I doubled up on my birth control the day after I missed it that I would be covered by the bc pregnancy wise. Whaaaats goiinggg ooonnnn? 😬🙏🏽