What should I do?

So me and my boyfriend have always used condoms. I'm not on birth control for personal reasons. But we have been careful except for the oops no comdom situation and I take the Plan B. Last week was one of those situations. So I quickly the next day bought it an took it. But last night we didn't have one an he pulled out. I know there could be a chance of sperm that came before he could feel it but we've done it before and no pregnancy but I'm worried that I might be an I don't want to buy Plan B as it messes my cycle and the more you take it the less effective it will be. An my log says 3% chance of pregnancy. But  What do you all think? Any feedback would be awesome. 

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