I been on birth control for several months now. But when I started one of my new packs, the first week, I missed 4 pills in a row and had unprotected sex in those days I missed. Then the next week I did the same thing and my boyfriend came inside me. The next day I started spotting. Could I be pregnant?

Yup, yes and could be. Missing means they don't work the way they should, and after missing the first week you should have waited to the end of the next month to even consider unprotected sex.

And of course even if you take them as you should there is still a small chance of getting pregnant, they are not 100 percent

Yes, you could be. You have to take your pills daily for them to be effective, even if you do there's the chance of pregnancy, so you should also use a condom. Sex=babies, there's no form of birth control that's 100%, but if you miss pills, well, you're playing with fire.

Now you get to play the waiting game.

Good luck.

Even if u miss one pill you mess up the whole month and u should advoid unprotected sex for that month, my dr told me since I missed a week when my purse got stolen I ruined that month. And I got pregnant and I am now carring twin girls. So I wouldn't be surprised if you are pregnant I wish you the best of luck.