Chance of pregnancy?

So I’m on the pill and I didn’t take my pill until the next day(aug 22nd) around 7pm(aug 21st pill) and I’m suppose to take it at 10:30pm so me and my boyfriend had unprotected sex like around 9pm and he pulled out and I took my pill on time that night as I was suppose too. Any chance of pregnancy (I’m on my placebo pills rn) that was the first time i missed a pill whole pack I also haven’t had my period in 3 months due to my birth control and I only have 4 day placebo pills I start a new pack in 2 days so I will be talking my pills on time and I will most likely change the time