I started my because 3 days late. Then I took 1, next night 2, next night 1, missed again, next night took 2, next took 1, (this is the time I would ovulate) next missed, then for the last two nights I've taken 1 normally and hopefully can remember to take normally for the week and a half left in the cycle. I have been
Having unprotected sex with my boyfriend and I have been on heavy duty antibiotics for the last week, today was my last day... What are the chances of being pregnant?

Depending on what antibiotic you are on chances are pretty good that you may have conceived. Many antibiotics render the pill totally and completely ineffective.

Birth control is not fully effective as you are using it. It's impossible to calculate your "odds" of being pregnant from this cycle but it is possible. Other factors such as whether you were sexually active close enough to the time of ovulation, how fertile you are, how fertile your partner is, etc. all come in to play. I would presume that you are pregnant until you know for sure. Stop taking the pill in case you are pregnant to avoid birth defects from the hormones in the pills and use an alternative form of birth control or abstinence for the rest of your cycle. You might want to avoid another close call by using a different form of family planning as it does not sound like you're really fully committed to, or maybe just struggle with remembering to take your pill every day at the same time reliably.

You should always use back-up birth control or abstain from intercourse if you are on antibiotics.

Stop taking the pill in case you are pregnant to avoid birth defects from the hormones

Birth control pills do not cause birth defects and she should continue to take them in the even that she is not pregnant.