The Pill & No Pulling Out

So I've been on the pill for about a month and two weeks now. I've taken the pill consistently around the same time everyday, except for one which I missed about 3 weeks ago, but I immediately took it the next day when I remembered. My BC pack says that missing one pill doesn't do any harm. Normally my bf and I still used a condom and he pulled out before he ejaculated, but now we're considering not using one and not having him pull out, just to experience it.

Do you think that I would get pregnant if he ejaculated in me, although I am on the pill? I know there is a SLIGHT chance, but is it a good idea?