a) precum is not totally 100% safe, there's usually a lesser quantity of sperm in that
b) we don't actually always know when we've had a preliminary squirt (it's a minor sensation amongst others at that moment in time), probably didn't happen but, might have
So yes, there's certainly a chance of pregnancy imo. The withdrawal method has gotta be about the worst method for birth control but combined with hopefully infertile times of the month, it works much of the time. I think you're really rolling the dice big time by using it during your fertile period.
You won't know until you take a pregnancy test, which isn't possible over the internet. Go invest $1 for one at the Dollar Store.