What are the chances I am pregnant on the pill?

I'm 18 years old and sexually active with my current boyfriend. I am a really anxious person and I know posting here may be dumb but I guess I need reassurance that I'm being stupid. We spent the last week together and of course we have had sex. I am on the birth control pill and I take it every day at the same time (the latest I've taken it was 45 minutes after I'm supposed to) and we usually use condoms but this time we did not use one. He pulled out but I know that method is bullshit. My birth control SHOULD keep me protected but for some reason I am really anxious about it... I am due for my period in a week. I know it was probably really dumb to not use a condom but it was on a whim and I'm really worried about it.