jacked up periods!!!??? help!!!

Ka
My period is coming every other month.   Like I had one November 3-9.  Then nothing December then January was 3-9.   Does anyone know what this means.   When am I ovulating.  How do I know when to take my ovulation test. Ugh this is all so frustrating.    We have been trying for so long. And now my body is whacked out.   Any advice ladies? Anything is appreciated