cramps

Autumn
so last month I skipped my period completely! I finally started on the 12th. It ended on the the 16th. Today I have period like cramps. according to glow it's my fertile window but my periods are getting further and further apart. they were 28 days then 30 then 33 then 36 and then I skipped a month. could I be ovulating and thays what I'm feeling?