Yes, there is a chance of you being pregnant. Since you missed most of your pills for awhile your body is not safe from getting pregnant. The only way to keep your body safe from not being pregnant when your on birth control is to TAKE your birth control. You never told enough information about the unprotected sex. Did he cum inside you? or did he pull out? Either way there are still chances since you didn't take your birth control. Yes, there is a lesser of a chance of you being pregnant if he did pull out, but pre-cum will always get inside you when having unprotected sex. Since you haven't been taking your birth control as you are prescribed, I would suggest talking to your doctor about getting you on a different type of birth control. There are birth controls you DO NOT need to take every day and they are a once a week thing, or you can get them for a once a month thing.
Orthoevra- A once a week birth control. For fist time use you put it on the day you get your period. Whatever day you got your period is now YOUR day. That means that every week you will change your patch on that day. You go 3 weeks changing patches (in a month you will use 3 patches) and on week 4 you will get your period. (I am on this birth control) and your period shouldn't last anymore then 2-4 days.
if you want more information: http://www.orthoevra.com
There is also a ring (nuva ring) you can put inside your vagina. And i believe this one is one you put inside there for a month without taking it out. Since i don't know much about this if you want information on it here is a website http://www.nuvaring.com
There are also injections yu can get.
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http://chair-a-tee.myminicity.com/ind go to that link