Hi,

I am 20yrs old and have been with my boyfriend(also 20) for nearly a year. We have recently had sex. He didn't ejaculate in me though, he pulled out. I have also been on Yaz birth control for nearly a year. I haven't missed a pill during this cycle but have taken 1 a little late. I am currently on my second placebo pill and haven't had any pms symptoms yet. My period hasn't started. I'm really scared that I might be pregnant.

Impossible to comment with such scant information.
If you are concerned you will need to wait until you actually miss your next cycle before you can take an HPT or blood test.

Sex causes babies, no method of birth control is 100 percent, Pull out just reduces sperm never stops all of them. All birth control bills have a small ( very small) failure rate,

So is it possible, of course it is, no one can know, in a week if you still do't have a period, take a test or go to your doctor for a blood test.