No, chances are small, but when you are in the 'small' group and pregnant, how do probabilities help?
Also, pre-ejaculate is not what you are talking about here. That rarely contains semen but that is what is released just when aroused, not when actually having intercourse. Pulling out is a recipe for babies.
And the dates you gave don't mean anything. A woman can even ovulated while still menstruating, or she can ovulate way off the middle of her cycle, or her cycle can be much shorter or longer than usual, and finally, the sperm can live in the uterus long enough for the egg to meander down the tube. So to make a long story short, any woman of child bearing age who has sex can get pregnant.
I take it you haven't had your period yet, since then? Go buy test kits, one by one, and test every few days. It's possible to get negatives and still be pregnant. Of course your period could be late, or you could even have stopped it with worry and stress. This is why the pill or patch are so comforting.
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