Help ! TTC ! LATE 7 days please read !

So my period ended 02/08 and I randomly started bleeding for 3 days on 02/19 the first day was a light pink very faint , the second day s little heavier and then the third day was a dark brown color . I didn't experience any cramps just slight pelvic pain . According to the app my period is not due until 03/02 . What could it be ?

Fast forward ⏩

My AF was due 03/02 , and it has not arrived according to glow I'm 7 days late .

Usually I follow the app on when af is do and is accurate mostly .

I've taken 3 test over the course of the week and nothing ...

I'm trying not to overthink it , I've been trying to concieve for about 7 years