Missed/ late period

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Hi, so I got off birth control pill in November. Before that I was on it for 7 years. At the end of November I got a period that wasn’t too horrible . It was slightly longer by about 2 days and heavier than my birth control periods. I am in a relationship with my boyfriend of 7 years, we are very sexually active but use condoms and the pill. Right now we are only using the condoms. I got off the pill because I was hoping getting off would help my anxiety and to allow my body to detox. So I missed my period, as of today I am 6 days late. Usually I am pretty regular. I took a pregnancy test Saturday that came out negative when I was 3 days late. I am super worried. Does anyone have any ideas? Tips? Advice? I don’t know what to do.