MISSED 4 PERIODS ALL TESTS NEVATIVE

hi guys no shame or bashing please.

I haven’t had a period for about 4 months now , however I have been consistently taking tests which have all been negative.

I did take about 7 plans bs within August- November. (3 month spam)

I have been having unprotected sex from November until now w my bf as we are not worried about getting pregnant.

Do you think the plan bs messed me up?!!

Or could it be I’m pregnant and it’s not showing up? Either way I have scheduled an appointment but I’m wondering if any of you guys have had this experience???