Are pregnancies on the pill that frequent?

I've seen many ladies in here saying they or their friends got pregnant on the pill. Is it that common? Because I'm quite freaking out now, I've been on the pill for more than 6 months and I had unprotected sex a few days ago, he came in me. I have missed around 2-3 pills that I took as soon as I remembered the next day but that was around 3 months ago when I wasn't sexually active. I always take my pill on time and haven't missed any of them in the past 2 months. 

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