Do Vines effectively protect against pregnancy?

Good morning, Four days ago I had my first real sexual intercourse. It lasted for a very short time and the partner did not end up in me (we did not protect ourselves). I have been using vines contraceptive pills for 7 months (I have not forgotten or delayed the time of its intake, I have not used medicines that could disturb its effect). I am very worried about whether there is a chance for a possible pregnancy or just stress plays tricks on me and there is no reason to worry. Please help quickly.