Chances of pregnancy?

I've been on pills for a very long time now and I've never missed one, but shit happens and I've been under a lot of stress recently and I forgot to start the new package so today should be pill 2 but I still havent taken the first one. What's even worse, out of all stress my mind is blury on when I took the last pill, but I'm quiet sure this is the 2nd day (since I tried to make myself memorize last friday as day I should get my period, which is 4th day from last pill). The problem now is I went to check on package instructions to check if I need to use protection for 2 or just one week. But then it said that if I had sex in 'break' week before missing the pill, there are chances of pregnancy. And now I'm worried af. I had sex only once, but we all know sometimes just once is enough...

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