Come one come all I need help 😭

Ao I'm still new to this whole ttc but can anyone tell me if they have this.problem or know anyone who has and what did you do or whom yu knw what did they do ? Sooo... I will start my period sadly lol buts it's so hard to mark my fertility window is b.x I'll get my period which usually about 8 days long then itll stop for 2 days or so and bam then I have a whole nother period for like a week. Can anyone explain or tell me what a going on? Or what I can do

I'll take any ideas or just anything