Is it likely to get pregnant the 26th day of your cycle?

Highly unlikely. I'm assuming you have a 28-30d cycle. In which case you ovulate on day 14-16...If the egg isn't fertilized within a day, meaning by day 15-17, then it won't ever and the likelihood of pregnancy is very low. At 26 days, i'd be very surprised, still why take chances? Get contraception. Consider an iud or implant, which are safe and work well.