What if i have sex while on the 4th day of continuing my third packet of the pill and decide i want this pack to be my last so decide i'll stop after this pack but i do not have sex again can i fall pregnant?

What if's...: Life is full of "what if's." Here, one asks about when to stop birth control pills yet avoid pregnancy from recent sex. The safer way for a woman to do this would be to stay on pills for 7 days after the last sexual activity. After 7 days, the sperm in her body should have died off. An important factor is her future contraceptive methods, as it is unlikely for a young woman not to have sex again.