Pregnancy outside fertile window?

So I had unprotected sex during my fertile window but we used the pull out method. But when we did decide to have a baby it was outside my fertile window and 6 days before my expected period. So he ejaculated in me everyday since the 28th of January and my period is due this Saturday but that was outside my fertile window. I took a pregnancy test way too early and it says negative but I'm already cramping. Does anyone think there's a possibility I might be pregnant??