Someone please help me out, ten points i need some serious advice.?

First off, i was on birth control but then I had to get off of it in the month of may because i had heart surgery in june. my periods usually come, the last day of every month sometimes even a couple days after there for, my period for april came may 2nd or 3rd. and my period for may came late, it came about June 6th or 7th. my periods last around 5 days. I'm not sure if how my periods come makes my cycle longer than 28 days. I had unprotected sex june 16, more than once. now, its july second my period hasn't come and my breasts have gotten a bit bigger, and i have very sore breasts as well. I'm not going to take a pregnancy test till maybe the middle of july because i may get my period still. I would like to know if i have a high chance of being pregnant? thank you so much,