missed pill and sex

How bad is missing a pill. I normally am so poignant at taking my pills on time (thanks to my fit but alarm) but I forgot to take a Friday pill. I doubled up on Saturday and took my Sunday pill as planned. Today was the first time I saw my boyfriend in 3 months and of course we had sex. He always pulls out, but I just want to double check to make sure everything is good. From what I've read on my information panphlet is that if as long as I double up I should be fine and if I miss more than two then I should worry. Anyone else ever gone through this. It'd be nice to just get reassurance from more than a pamphlet