Condom broke .. freaking out!!!

So my husband and I had our first condom break tonight. We didn't know it broke until he pulled out seconds after beginning to ejaculating.. then he finished in his hand..he doesn't even actually know if any got inside me because we normally wear a condom and pull out. My period ended 5 days ago and my fertile window begins in 2. Should I be worried? What's the chance I'll become pregnant? I really would like to not take plan B if I can pass on it.