HELP PLEASE

 My periods have been regular. Always come the 5th day of my sugar pills. I just got off the third period on April 30th since my scare in Feb. I try to be very safe. I use birth control pills correctly (always take them at 6pm), use a condom, and also pull out wearing a condom. My BF never ejaculates inside of me, even with a condom. My BF also had two undescended testicles as a child (didn't have them fixed until he was 7 or 8) and is highly likely to never have children. We always check the condoms before, during, and after sex. After sex, we fill the condoms up with water to see if they have broke. So far, none of the condoms have broke. No water ever leaked out. I've taken 6 pregnancy test and all say negative. I haven't had sex since April 22nd. My period started the 26th and ended the 30th. My next period is May 24th. I started antibiotics the beginning of May, so I have not had sex to be on the safe side. I have not had sex since before my last period. Am I pregnant? Please explain your way of thinking on this.