I Already know The Answer but …

Kelsey
But I Just Need A Second Opinion. 
So Yesterday I Gave My "Boyfriend" Head and He Cummed , after He Came I Continued To Rub His Dick Witch still Had Cum On It . After Like 3-5 Minutes we Had Unprotected Sex and He Didn't Cum He Just Wanted To Make Sure I Got Mines .
So My Question Is Even Though My Period Came Today (less that 24hours After We Had Sex), Is Their Still A Probability That Some Sperm Still Survived and I Might Have Fertilize The Egg ?