I don’t know what to do. Help!

I need help! Ive been irregular for some time now but it’s never been this long. I’m always late a week or so… these past few months, this is how my period been looking. I get really bad cramps but my period doesn’t come. I took a pregnancy test and came out negative around February 20th when I got my “period”. I bled very minimal for the first day and the second day it was just drops of blood.. i haven’t taken any pregnancy test because I don’t feel pregnant.. but now idk if i should be concerned and get checked out for this.. im only 24 years old so im not understanding why my period hasn’t came really. Ugh advice.