My period is over a month late! 😱

My period is almost a month and a half late! Last night and today when I wipe I've been having brown discharge and early this morning I had a couple bad cramps and that was it.(sorry tmi) so I thought it would show up today. But once again....nothing.  I've taken many pregnancy tests all are very strong immediate negatives. I stopped talking the mini pill over 2 months ago because it made me very moody. When we have sex he always wears protection and we have yet to have any accidents. Could my body still be adjusting from going off birth control? Or is this something I should call my doctor about? (Side note: after having babies my periods became irregular but I've never gone this long without one). Help! 😭😰