When’s my next period due??? When’s my ovulation day???😱😱😱

Here’s my period days for the past few months ago, one truck and confuse and so worried when I am ovulation and when’s my next period is due! Usually my period is 7 length long but I’m confuse... I’m asking for help, if anyone can please help me how long is my cycle days for my next period is due.

December 2017 - 31st to January 4th 2018

February 2018 - 3st to 9th

February 2018 - 28th to 5th March 2018

When do I ovulate???

I have all these weird beginning days and ends

of my period.

Thank you so much for readying this, and hopefully someone can help me out with this