I Have A Very Irregular Period. Sometimes It Skips Up

I have a very irregular period. Sometimes it skips up to three months. Last time I got it was March.16.2018 and then I got it yesterday May.25.2018. I had unprotected sex Yesterday The first day of my period but we used the pull out method. What is the likelihood that I could get pregnant? Also if I was to get pregnant would my period stop or continue and not come on my next cycle?