Irregular periods interfering with ovulation?

Danielle
The last three months I have had irregular period. The month of April and may I had two periods each month. The month of June, I still have yet to have my period. 
​I use my period to track my fertility and ovulation days, I am not on birth control nor does my partner pull out. 
​I am wondering if anyone knows when I actually ovulate if I had two periods in one month.