How Accurate?

So me and my husband had sex the day after my last fertile day and it said 3% chance and then we had sex a couple days after and it said 3% and we did today and it said 3% (days I listed is when he came in me) how likely is it that I could be Prego my period is in 5 days. I'm just curious if any one has gotten pregnant on the days that said 3%?