How do you know when your ovulating when you have irregular periods one month it'll be at the beginning one month in the middle or the end... February I had bled twice the second time i bleed I took a test after just for the hell of it and it was neg well I started bleeding heavy March 3rd and it ended the 6th I took an ovulation test the 14th March and it was  lighter than the other line well today I have been cramping on and off and spotting brown/pink  and a little nauseous extremely tired very moody I have also been ttc for 4 months now could I be pregnant? Why do I bleed like that? I don't know when I'm fertile or ovulating all my apps say differently  Please help.